Congratulations!. Yes, these stellar admissions do present a dilemma in making a choice. Any one of the three will offer many great opportunities.
Stanford & MIT would offer the most opportunity in Technology. The 5 year combined BS/MS program at Stanford is a plus. MIT students (Sophomores, Juniors & Seniors) can cross register for classes at Harvard, and allows them to combine the best of engineering with great liberal arts coursework (http://web.mit.edu/registrar/reg/xreg/ugradMITtoHarvard.html). However, if you did not connect with the student body at MIT, then you have to trust your instincts.
Not to confuse further, a very recent study by the Brooking Institutions takes into consideration value added dimension that might be helpful.
http://www.brookings.edu/research/reports2/2015/04/29-beyond-college-rankings-rothwell-kulkarni
With the information available:
Choice 1 - Stanford (laid back - transitioning from high school environment to competitive college environment may be easier)
Choice 2 - Columbia or MIT (depending on the level of antipathy to student body at MIT)
(The assumption is that all the three are equally affordable)
Good luck.