Nick I think you'll like the SA voices on the T2 better. There was a HUGE discussion on the Motifator forum requesting that Yamaha give XS users more T2 voices, plus there was a debate between the sound quality of the Xpanded Articulation vs. Super Articulation.

You'll find the Motif XS easy to navigate. All the voices are in categories, and the new screen will help out too.
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.