The CO 752 has the full AVOD set and in-seat power for your own entertainment. Not truly flat, but the 757 seats are pretty comfortable and I prefer them to the lie flat at an angle.
As for the fuel stop issues, those are westbound and generally only in the winter due to the winds. Not so much of an issue this time of year.
If you don't have to be in OSL in the morning for work, I'd take the connection. Keep your miles in your preferred program. If you're going to have to work in the morning, take the non-stop and get where you're going.