My modest opinion:

Went through buying/trying quite a few of these
CP 99 , accurate and relatively powerful , horrible heavy trigger.
CP 88, accuracy ok, good up to 6m, nice, light trigger action.
Didn't try the 1911, a few others but as you've narrowed your choice I won't cloud the issue.

In the end I kept the 88 in shiny black, with wood grips and a silencer which is very effective. The 4' not the comp.
I also kept the PPK/S. It's bb, but top fun to shoot, only £95 new. Get rid of the horrible handle at the bottom of the grip and use an Allen bolt and it looks the part.

Google replica co2 collection. Fantastic info n all co2 guns, all specs etc.,

Oh yeh, and have fun!