Between the sets you have mentioned, I prefer the GHS Pressurewounds. They have a deeper tone than regular rounds, close to flats. They are smoother than rounds but still have the feel of them, which is cool to me since they are kinder to my fretless fingerboards. And yes, they are brighter than flats, but not near that of a regular round. They sort of split the difference between flats and rounds.
www.bpstrings.com has the best price on the web for them that I have seen so far.
FG