After some time using Marlin 1.1.4 here is my pro con list compared to Repteier 0.92.9:

Pros:
Autoleveling/Autocalibration works quite well.
Buffer management helps out with complex g-code and 8bit processors.

Cons:
No Z Babystepping in situ from LCD.
No method for manually setting Z height from LCD - auto only.
No web/gui configuration. Took me a day to get my config files all correct.

The quality of the prints seem nearly identical...except for the fact that Repetier 0.92.9 hiccups on my 8-bit processor causing some pretty nasty "zits" and Marlin 1.1.4 does not.