I presume you know the spec of these bikes. The 900 is a lot easier to source tyres for as they have 17" wheels, while the 750 uses 16". 900 has later 4pot calipers also.
Yes, thank you 900streetfighter. Not a huge fan of the 750 but recently bid for one with 851 wheels and suspension, which would have been nice. Will keep my eyes open for a 900....