pianow i wanted to know what would you pick between the two and which is more versatile?
I would say it depends a lot on your repertoire and playing style. If you play a lot of classical music, I would be very hesitant to recommend the Fazioli as it's really more geared towards jazz and contemporary music. More typical classical repertoire like Brahms and Schumann, for example, sounds oddly out of place on this instrument.
Apart from that, be sure you know what you are getting yourself into in terms of the tone, as it's quite unlike most other pianos (very flat and linear), and based on internet feedback, a fairly high percentage of those who have tried it do not end up liking it very much.
But if you're playing mostly contemporary music and like the tone, it could work for you.
The Steinway has a much more traditional sound with stronger bass, richer overtones and more tonal variation, and I would say it is definitely the more versatile of the two, but is not without flaws. As David mentioned, something is a bit off with the velocity mapping, which results in a somewhat less responsive playing experience compared to the other Synchron pianos. Some people find it a touch aggressive and hard at the higher velocities, although this doesn't bother me so much personally. Softer velocities are gorgeous, however.
VSL just release a video comparing the two, so maybe this will be of help:
However, if you really want the best and most versatile VSL piano, I would skip this offer period entirely and wait for the next time the Yamaha CFX goes on sale. If I were only to have one, that would be the one, followed closely by the Bosendorfer Imperial.