Personally, I find the most stark difference in candidates for governor in Massachusetts this year to be competence. One has muddled through four years in office while the other is ... well, admittedly, I can't say for sure Baker would be a clear improvement, but it's worth taking a chance.
It's funny how much more effective Patrick has been than Republican governors, in spite of his problems, by virtue of being in the same party as the legislature.
Bill Weld was rather effective at working with the legislature. Mitt Romney, not so much, but that was more by choice -- he was much more interested in butting heads than in making compromises.