Got both XT M8000 and XTR M9000. XTR has a lighter action and is more polished/posher looking. Functionally, XT is better i find. I’m guessing that as it was launched after XTR, they had chance to iron out the minor issues (clutch lever position, overly light trigger action)
If it was me, i’d save the £200. XTR really isn’t worth it, there is zero performance gain and if anything, the XT has a nicer action in use.
Look at the other spec items though. If the XTR model has better shocks/forks/wheels/tyres etc then the £200 extra would be better justified there. if spec is otherwise identical then just get the XT model