It's largely personal preference.
While we leaned heavily towards "Gamist" mechanics with Trailblazer - and which the SWSE/4e skill system certainly is - I prefer some variation in ability in the skill system.
In the 3ed/PF system, you can have two characters that have placed ranks in and are trained in a certain skill but have varying ability levels in that skill. In 4e, it's much more black & white. You are either trained or you're not and your "ability" in that skill will the same as another character that is trained or untrained.
I also like the customization the 3ed/PF system gives you by allowing you to spread around your skill points as you choose. You can either focus on and be very good at a few skills or be more of a jack of all trades.
But both system removes the biggest issues with the 3ed skill system: cross-class ranks and the x4 multiplier at first level.
After that, it's personal preference.