Depends on what you need. 950 is lighter, has much improved Vocal Harmonizer, great new guitar voices and distortion effects, yes, the audio styles for what they are worth, speakers, new buttons, new drum kits, etc.
Tyros has three pedal inputs, three right hand voices, no wall wart, etc.
Check all the features you want, and see which one suits you best!
I said a few years ago that I was totally finished with Yamaha until they addressed the Vocal Harmonizer and the weak drums. Now they have done that, at least to a point, and I find the 950 usable again. I still find Tyros too big and clunky to tote around. It will not fit in a standard 61-key bag, and won't fit on a 61-note-sized stand.
It seems there are no bad choices in arrangers these days, just pick what suits your needs at the time!
DonM