Chest: Incline bench press vs Bench Press. For me it has to be bench press. Even though Incline is harder i just love BENCH PRESS!!!
Shoulders: Military Press vs Shoulder Press on machine. Definately Military Press for me. Special mention to Shrugs and side lateral raises.
Back: Deadlifts vs Pull ups or Lat Pull downs. I’d say Deadlifts.
Legs: Squats vs Leg Press. Leg press has actually done great things for me. Leg extensions are also great but i d say Squats.
Arms: Barbell Curls vs Tricep pull down (if done correctly this exercise rocks) This one is tough, because they are different muscles (i couldnt be stuffed writing about all the muscle groups, just briefly) I’d say Tricep pull down.
Abs: I think throwing medicine ball to trainning partner works best for me.
This is just my opinion guys, I may have missed a few great exercises. What do you guys think? What works best for you?