I've never heard the Logans but the F100 (your title says 200, your post says 100) is considerably larger than the Founder 100F, the 200F even more so. On paper, the Logans should have more low bass as well. Not that the Founder 100Fs don't have bass - mine do more or less follow Paradigms DIN 26Hz spec and put out useable bass down to the mid 20s in my room. The Logan's F3 is lower though, so they should do even better on the low end.
On the top end? I recall some reviews mentioning the ribbon in the Logans being somewhat bright, although the Paradigms also get accused of being tilted up a bit too.
On the looks side, I'd take the Paradigms for sure.