Most of my bikes use Terry Butterfly saddles, which are nice firm plastic saddles with leather covers. However, I also have Ideale and Brooks leather saddles, which I like almost as well. I like to buy my leather saddles used, so they are already a bit broken in (and can be less expensive!) My wife has an upright bike, and she uses a Serfas Rx saddle. I have tried it and it is Very comfortable. It's firm but with just a bit of give for those pesky butt bones. I think she also has a sprung seatpost, too, which can take a bit of shock.

I've tried neither of the specific synthetic saddles you mention in your post, but I would be skeptical of any gel or other soft saddle. They typically are comfortable for only a short while. So if you like to ride more than five miles at a stretch, then the firmer saddles would be better.