What factors to consider when choosing between similar tenure-track offers? When one is fortunate enough to have multiple tenure-track offers that are roughly similar (research-focused institutions, similar levels of prestige, salary offered and teaching load), what factors should one consider?

Naturally, the weight of different factors can be subjective, so I am more interested in what types of things to consider and why, rather than what is the final choice that should be made.
You might want to check into details about "tenure track." At some institutions this means they won't automatically fire you at the end of your appointment period, but your chances of actually getting tenure are very low. At others, tenure-track faculty who do a reasonably good job are almost sure to get tenure. And of course, there's a whole spectrum of meanings for "tenure track" between these two extremes.  (My own department's official policy is to make tenure-track offers only when we think there's at least a 50-50 chance of the person's getting tenure; in fact, our promotion record in recent times has been way better than 50-50.)  I'd suggest you find out, from each of the departments that offered you a tenure-track position, what percentage of the people hired into such positions in, say, the last 15 years got tenure.  (You might also ask what happened to the others. Were they denied tenure? Did they leave voluntarily for other jobs before coming up for tenure? Did they leave "voluntarily" because they realized they were unlikely to get tenure?)