It's worth noting that you can only attend MIT but take classes at Harvard if MIT doesn't offer them; if you're only attending for one semester of your freshman year, you probably won't be able to take any classes.
Edit: Not actually true, see below. My apologies!
It's worth noting that you can only attend MIT but take classes at Harvard if MIT doesn't offer them;
As an MIT student, I can certify that this is false. You can take any Harvard classes that you want as long as you're willing to make the commute. What you may be thinking of is that you often can't get specific credits (e.g. satisfy a humanities requirement) by taking Harvard classes that have equivalents at MIT.
I, and a lot of other people my age, are currently facing a pretty big life decision -- where to go to college. Since this is probably going to have a pretty big impact on my life, I'd like to get some more information on this.
Seeing as a lot of people here have probably made this choice already, gone through with some of the consequences of it, and are rational, I decided to ask here.
My current considerations are: