Next I happen to have the G17 and a P99.
I would have to say on my guns the G17 has less but not by much. Both guns have very tame recoil and are very accurate.
Probably the best thing for you to do is find a gun store with a range in it that will rent them.
FYI. Just in case you have not see the prices. New P99s are starting at 700 in most places and the Glocks are in the low 500s or upper 400s you might want to wait if you decide on the Glock. Jan 2010 Glock is releasing the Gen4 Glock. Read about them here