I need to fly from YYZ to BUD this summer. I have looked into various airlines, and the prices and flight times are all pretty similar. Assuming your only consideration was comfort and service in Y, which airline/routing should I choose?

AC or LH via MUC or FRA (TATL flight may be operated either by LH or AC)
AF via CDG
KLM via AMS
BA via LHR

Any other routings I should consider?

Earning miles is not important.