I currently have several sets of CZ grips. I have LOK Bogies (both thin and standard thicknesses, but no palm swells for my hands), VZ Diamondbacks, stock rubber grips, a set of useless slick plastic CZ 75 grips, a couple sets of the original SP-01 Shadow stock grips (with tape inserts), and the original CZ blue aluminum grips that came on my Shadow 2.
I prefer LOK Bogies over everything else I have tried... The VZ Diamondbacks are pretty good too, but it really boils down to personal preference. I know of no other way to learn what you like best, other than to pay your money and use them for a while. Merely trying your buddy's grips for a couple minutes may not be long enough to decide.
My suggestion is to buy a set of LOK Bogies (with palm swells if you have huge meathooks) thick, standard, or thin as your hand size dictates. The thin grips were too small for me, and palm swells are too thick. I didn't have to buy palm swells to know that...
You might not even want to look further after trying a set of Bogies... I'm not!