Very personal decision. I haven't played any length of time with first gen Predator equipment, but some people swear by it. I know the second gen improved deflection but that may not be a big thing for someone at the expense of hit, feel, etc.
I've used Z2, 314-2, and now Mezz WD700. Liked the Z2 a lot, very little deflection, but found I was abusing the spin a bit with it because I was so comfortable with it. The 314-2 once I got used to the thicker and heavier feel was nice, felt more solid, but the difference in deflection took a while to get used to. Using the Mezz now for the last 2 weeks, very similar to 314-2 but so far I like the more solid and stiffer feel, time will tell...
Scott