Deciding on my undergrad: Dartmouth or Amherst (and I mean Amherst/Dartmouth college, not UMass)

Hi all,
I'm currently an HS senior tryna decide on my undergrad ED.
I go to a pretty selective prep school, top ranked in the nation, and we have yet to have a dartmouth or amherst ED reject in the past 10 years with probably a good 20-30 applicants, and given my stats, I highly doubt I would either (I have a full ACT, a lot of XC's, 4.28 GPA, national science awards, etc.). However, because ED is binding, I would like to make a more educated decision. My target is IBanking/HFund but I'm not hard set (thinking of pre-med as well). I visited a lot of the northern schools and found that Amherst and Dartmouth were two schools I really liked; given their proximity to NY and Boston, they had fabulous opportunities, also I really liked their undergraduate-focus, + I liked the smaller feel of each school (more focus to each individual student), and I wanted a place that had strong alumni-relations for future opportunities, esp in IBanking where from what I've seen alumni relations are quite important. School-wise, I'm sure I would enjoy any one. I'm a semi-partygoer so I'd be down with the DM frat culture, but also I'm p sure I'd like my time at Amherst too.

I'm well aware of Williams as well, but my impression is that it is worse than Amherst opportunity-wise.

Just from your guys' views, from people on Wall Street or in econ in the northeast, what would you say about each? I know dartmouth has a stronger presence on the street, but keep in mind though Amherst is small and has a very tight alumni network from what I've seen, and I think maybe that also makes it a good candidate? From what I've seen, high ranking LACs usually are a pretty good target. Does each school get good recruiting? Which would you guys recommend, and why?