Hi, I am flying the following route (all flights are on one ticket, open jaw):
BOS-YHZ-LHR + CDG-YUL-BOS, booked on Orbitz.

US-Canada leg - AirCanada (operated by JAZZ)
Canada-Europe - Lufthansa (operated by AirCanada)

What program for miles would you suggest to use for this flight to get the best value? I am US-based, and I am nowhere near hitting a loyalty level with one of the programs. Meanwhile I put "one pass" as default, but after doing some research, I think Aeroplan has more value. Any thoughts? Thanks in advance.

Fares:
SKX6NCE
SKWNC95N