Just the form factor and aesthetics.
I think the keybed on the 37-note Polar is a general synth-action, so it's slightly different to the semi-weighted 61-note TI. - However, both still transmit velocity and aftertouch.
That's all there is to it.
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PS > And another thing! Will the Ti|3 have user customisable/importable wavetables?  A ribbon-controller or XY-Pad might be nice, too, please! Thanks!
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