I would go with the S910, personally, but for me it's a matter of weight and portability. If I were never going to take the keyboard out on a gig (job--sorry UD), then the T-4 would be my first choice.

Good luck on whatever you decide upon,

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)