For Biochemistry in particular, I would suggest these are pretty much just peer colleges, meaning neither is “better” for that major. Both are going to be great for undergrads interested in research. Both will do an excellent job supporting internships–I guess F&M is closer to Philly which is a big Health and Life Sciences city, but I am sure Richmond will help you find suitable opportunities too.
So personally I would suggest choosing whatever school feels like the best bet for you to be happy.
As usual, if possible visits would be good, but it is late in the process if you are comparing actual offers. So for what it is worth, although similar sorts of colleges at a high level, my sense is Richmond and F&M appeal to somewhat different sorts of students at our HS. I would not describe Richmond as not welcoming, but I have gotten the impression more of the students attracted to Richmond are toward the ambitious/pre-professional end of things, whereas F&M students, while smart and motivated, tend to be perhaps a little more chill.