Delta Vs AF

I am planning on a trip to peru next year and I have a couple of options. One would be to go with delta and build up my airmiles, the other would be go with airfrance which has slightly quicker routes and slightly better travel dates. The routes would be as follows
AF
Manchester - Paris (CDG) - Lima (777-200)
Delta
Manchester - Atlanta - Lima (767-300 and a330-200)
I think i prefer the seating plan in economy on the delta flights as there would be two of us and hopefully we could get one of the 2 seat configurations.
Does anyone have any experience of these routes and which aircraft/company would you recommend?
Cheers
AF
Manchester - Paris (CDG) - Lima (777-200)
Delta
Manchester - Atlanta - Lima (767-300 and a330-200)
I think i prefer the seating plan in economy on the delta flights as there would be two of us and hopefully we could get one of the 2 seat configurations.
Does anyone have any experience of these routes and which aircraft/company would you recommend?
Cheers