The only feature that really maters in a film camera body is the light meter. The F5 has by far the better meter. The F5's Color RGB meter is what is used in the modern DSLRs. and it's good. The F100 has the same meter as my N90. It's good, compared to even older Nikons but the 1024 segment RGB meter is smarter.
But the F100 will be lighter and handle quicker, Hands down the F5 is better built but solid metal weighs more than plastic. I remember when the F5 first came out. Long time Nikon shooters were amazed by the new RGB meter. You could shoot a snow screen without using exposure compensation. No way would the F300/N90 do that.