First of all, you can't sample with a T3. Or a PA2Xpro, for that matter. You can play BACK samples, made with something else, on the T3, but the choice of samples already made is miniscule compared to Korg, who allow Akai import (the most popular sampler format), whereas Yamaha insist on their own proprietary format, or just plain .wav import, which makes you do ALL the work (sampling acoustic instruments well is a science AND an art!).
And secondly, have you played the PA2Xpro? It's piano sound is light years ahead of the PA1Xpro, plus it's Akai sample playback capability gives you access to some excellently sampled piano sets from people like William Coakley, EastWest and others.
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An arranger is just a tool. What matters is what you build with it..!