With so many different cabin configurations, selecting any seat on Aegean assuring the best legroom can be a hit or miss affair . A full breakdown is provided below but after distilling the information, the best advice I can offer you would be ignore the detail (the pursuit of securing the best seat will torment you) and just follow the cliff notes below.

Airbus A319
Row 1 has 16.5" knee room
Rows 2 to 10 have a 29" pitch
Row 11 (exit) has a 40" pitch
Rows 12 to 24 have a 30" pitch
Row 25 has a 29" pitch
As there is only one A319 in the fleet, there is a 100% chance of certainty

Airbus A320ceo
Seats 1AC: knee room varies between 20.5" and 43.9"
Seats 1DF: knee room varies between 20.5" and 23.5"
Rows 2 to 4: pitch varies between 32" and 34"
Row 5: pitch varies between 30" and 34"
Row 6: pitch varies between 30" and 32"
Rows 7 to 9: pitch varies between 29" and 30"
Row 10: pitch varies between 29" and 32". Seats do not recline
Row 11 (exit): pitch is 34". Seats do not recline though
Row 12 (exit): pitch is 33"
Rows 14 to 30: pitch is 28"

Airbus A320neo
Row 1 has 23.5" knee room
Rows 2 to 4: pitch is 32"
Rows 5 to 10: pitch is 30". Row 10 seats do not recline
Rows 11 and 12 (exit): pitch is 35". Row 11 seats do not recline
Rows 14 to 31: pitch is 28"

Airbus A321ceo
Refer to post 3 for info on the latest A321ceo configurations
Seats 1AC: knee room varies between 20.5" and 53.5"
Seats 1DF: knee room varies between 20.5" and 23"
Rows 2 to 8: pitch varies between 32" and 34"
Row 9: pitch varies between 52" and 68"
Row 10: pitch is 31"
Rows 11 to 22: pitch is 30"
Row 23: pitch is 92"
Row 24: pitch varies between 28" and 87"
Rows 25 to 35: pitch varies between 28" and 29"
Row 36: if applicable pitch is 29"

Airbus A321neo
Row 1: setback of 27" (that is the distance of the seat front stud to bulkhead. Edge of cushion to bulkhead should be about 25")
Rows 2 to 7: 32"
Rows 8 to 16: 30" (there is no row 13)
Row 17: 40"
Row 18: 38"
Rows 19 to 24: 28"
Row 25: 29"
Row 26: 28"
Row 27: 30" (this row is 4-abreast BC-DE, with narrow seats)
Row 28: 49"
Rows 29 to 38: 28" (Row 38 has narrower seats)


Here follows a detailled breakdown of individual cabin configurations and as you can see, there are a great many and the list isn't even exhaustive.

Airbus A319ceo

Registration: SX-DGF
Configuration: 144CM
Row pitch:
Row 1: 16.5" (between bulkhead and leading edge of seat cushion)
Rows 2 to 10: 29"
Row 11: 40"
Rows 12 to 24: 30"
Row 25: 29"


Airbus A320ceo

Registration: SX-DGC, DGN, DGO, DGR
Configuration: 174CM
Row pitch:
Row 1: 20.5" (between bulkhead and leading edge of seat cushion)
Rows 2 to 4: 32"
Rows 5 to 6: 30"
Rows 7 to 10: 29"
Row 11: 34"
Row 12: 33"
Rows 14 to 30: 28"


Registration: SX-DGD, DGE
Configuration: 174CM
Row pitch:
Seats 1AC: 43.9" (between bulkhead and leading edge of seat cushion)
Seats 1DF: 23" (between bulkhead and leading edge of seat cushion)
Rows 2 to 4: 32"
Rows 5 to 6: 30"
Rows 7 to 10: 29"
Row 11: 34"
Row 12: 33"
Rows 14 to 30: 28"


Registration: SX-DGI, DGJ
Configuration: 174CM
Row pitch:
Row 1: 23.5" (between bulkhead and leading edge of seat cushion)
Rows 2 to 5: 34"
Row 6: 32"
Rows 7 to 9: 30"
Row 10: 32"
Row 11: 34"
Row 12: 33"
Rows 14 to 30: 28"


Registration: SX-DGK, DGL
Configuration: 174CM
Row pitch:
Row 1: 20.5" (between bulkhead and leading edge of seat cushion)
Rows 2 to 4: 33"
Rows 5 to 9: 30"
Row 10: 32"
Row 11: 34"
Row 12: 33"
Rows 14 to 30: 28"


Registration: SX-DGC, DGN, DGO, DGR
Configuration: 174CM
Row pitch:
Row 1: 20.5" (between bulkhead and leading edge of seat cushion)
Rows 2 to 4: 32"
Rows 5 to 6: 30"
Rows 7 to 10: 29"
Row 11: 34"
Row 12: 33"
Rows 14 to 30: 28"


Registration: SX-DGV, DGX
Configuration: 174CM
Row pitch:
Row 1: 23.4" (between bulkhead and leading edge of seat cushion)
Rows 2 to 5: 34"
Row 6: 32"
Rows 7 to 9: 30"
Row 10: 32"
Row 11: 34"
Row 12: 33"
Rows 14 to 30: 28"


Registration: SX-DNA, DNB, DNC, DND, DNE, DGY, DGZ
Configuration: 174CM
Row pitch:
Row 1: 20.5" (between bulkhead and leading edge of seat cushion)
Rows 2 to 4: 33"
Row 5 to 9: 30"
Row 10: 32"
Row 11: 34"
Row 12: 33"
Rows 14 to 30: 28"


Airbus A320neo

Registration: SX-NEA, NEB, NEC, NED, NEO
Configuration: 180CM
Row pitch:
Row 1: 24.5" (between bulkhead and leading edge of seat cushion)
Rows 2 to 4: 32"
Rows 5 to 10: 30"
Rows 11 to 12: 35"
Rows 14 to 31: 28"


Airbus A321ceo
Refer to post 3 for info on the latest A321ceo configurations

Registration: SX-DGP, DGQ
Configuration: 201CM
Row pitch:
Row 1: 20.5" (between bulkhead and leading edge of seat cushion)
Rows 2 to 8: 32"
Row 9: 52"
Row 10: 31"
Rows 11 to 22: 30"
Row 23: 92"
Rows 24 to 35: 28"


Registration: SX-DGS, DGT
Configuration: 201CM
Row pitch:
Seats 1AC: 53.5" (between bulkhead and leading edge of seat cushion)
Seats 1DF: 20.5" (between bulkhead and leading edge of seat cushion)
Rows 2 to 8: 32"
Row 9: 52"
Row 10: 31"
Rows 11 to 22: 30"
Row 23: 92"
Rows 24 to 35: 28"


Registration: SX-DNF, DNG
Configuration: 202CM
Row pitch:
Row 1: 23" (between bulkhead and leading edge of seat cushion)
Rows 2 to 8: 34"
Row 9: 68"
Row 10: 31"
Rows 11 to 22: 30"
Row 24: 87"
Rows 25 to 36: 28"


Airbus A321neo

Registration: SX-NAA, NAB, NAC, NAD
Configuration: 220CM
Row pitch:
Row 1: 25" (between bulkhead and leading edge of seat cushion)
Rows 2 to 7: 32"
Rows 8 to 16: 30" (there is no row 13)
Row 17: 40"
Row 18: 38"
Rows 19 to 24: 28"
Row 25: 29"
Row 26: 28"
Row 27: 30" (this row is 4-abreast BC-DE, with narrow seats)
Row 28: 49"
Rows 29 to 38: 28" (Row 38 has narrower seats)

Overwing exit rows are 17 & 18 and rear cabin exit (door 3) is at row 28.