The last time I picked up a Tyros2 in a case I thought I would get a hernia. It's big, bulky and heavy. The S950, in contrast, has a smaller footprint, lightweight and from what I've been able to determine thus far, has all the features any performer would need.
Good luck with whatever you decide upon,
Gary

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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.)