I just recently switched from a 77 to a 88s and I must admit that the 88s is a (for me) much nicer racket. There is more power and control in it and it suits my playstyle at lot more. I would recommend the 88s over the 77 to anyone who knows how to play. The 77 is in my opinion better for older or younger players needing more power in their game.
I love ax88s after ax77 cz ax88 give me more control. When on back court even on the net. I use 3u version with bg65ti 30lbs on frame.