Well, another thought is to consider which job would be easiest to move on from, or to advance in.
Seriously, this isn't a job that will have lifelong consequences for you. People change jobs much more frequently today than they did even 20 years ago.
Imagine, for each job, that you'd been offered that one and lost out on the other two. Which one would have made you the most excited to land? (Maybe thinking, well, those other jobs weren't nearly as great as this one.)
And jobs often are what you make of them. There are imponderables out there, like what kind of relationship you'll have with your boss and coworkers. You won't get a REAL feel for that until you've been doing it awhile.
One other thing--is there any possibility of negotiating a higher salary or some other benefit by informing the hiring team about the other offers? Maybe some perk that would benefit you?