Three schools most won’t know although everyone knows the Gettysburg address. 
So I wouldn’t say or worry about which is better - they’re all good if your student takes advantage.
Look at the niche student section - they’ll give you comments or words to describe the students, etc.
About Gettysburg, the top 3 are:
work hard play hard
Intelligent
Stressed
About F&M, the top 3 are:
Academic
Dedicated
Stressed
It’s a bit smaller. Of course they use the city because it’s in the city. Story of one - but one person I call on for work went there for Poli Sci and said it was a scam and his kid couldn’t get a job. Was it the school or kid? He was full pay.
Denison’s three words are:
Diverse
Open Minded
Outgoing
In the end, where did the student feel most comfortable - including environmentally.
And for what it’s worth, Party Scene wise, Niche says Gettysburg an A-, F&M and B and Denison a B-.
Good luck