Don't forget, the 627 is built on a medium frame while the 608 is built on a large (i.e. 44 mag) frame. I batted both around for a long time and went with the 608; glad I did now. The combo of weight/porting/grips makes the recoil and muzzle flip very managable.
Also, the forged Titanium barrel has a stainless sleeve in it which forms the rifling. No doubt the Taurus engineers stress tested this combo till the cows came home, but something in me said the coefficient of expansion between the ss and the Ti right there in the hot zone where the 'hounds from hell' come out was going to be a problem some day. Thus the choice for an all stainless barrel/frame.
Hope this info helps.
John