I find the 722 Closed Captions to work better.
(1) I can use the small size and not get mising portions of the characters.
(2) When scrolling the 622 I would sometimes lose portions of the text display.
(3) The 622 would sometimes repeat phrases and drop letter(s) off the end.
To me the display is crisper, a better resolution. Its hard to be quantitative because my Samsung HL-S5687 DLP does not let me turn off overscan and keep it off and the 622 is now on a CRT projector and I cannot make copies of the HDnet test pattern 12 minutes.
I'm not sure which is faster for some guides and menus--the 722 should be.
-Ken