The street is the tarted up sister that slaps on a load of make up before enjoying afternoon tea...
The MT is the furiously wild child that will end up pregnant at 16.
In fairness I would of considered the street again because it does have: better bite on the breaks, better standard suspension. I will miss my quickshifter and tyre pressure monitors but I wont miss the fact that the little tart needed to be washed EVERY day to prevent massive amounts of rust especially on the exhaust system. It was very fussy about oil as it would eat certain brands (100ml per 200 miles) and it was EXCEPTIONALLY expensive to keep and service. Triumph wanted £220 for annual (6k) service and then £680 for bi annual (12k) service in order to keep that much needed warrantee in order. It was always in for some kind of replacement, all be it usually very minor. Such as, mist in headlights or indicators, water in the clocks, paint flaking off the radiator or alternator etc.
The street was and still is one of the best bikes I have ever ridden, but its a bit of a faff and I wasn't happy to pay triumph money for servicing anymore. The MT offers a completely different attitude. Playing with the torque is great fun similar to the speed triple, but it feels so well refined and trust worthy. Fantastic build quality and eye for details from yamaha. Its cheaper to run and service and it is the only bike I have test ridden in the last 3 months that made me laugh as I rode it.