This is all preliminary since the Oaks have only been on a week (prior = hybrids 2+ years, VERY happy).
For the first 2-3 days, I was thinking, hold on to that shipping box, I might want to sell these, I don't think these are going to work for me. They had a fairly nasal and clunky ("old timey") aspect to them that contrasted with the hybrids that I LOVE and which are rich, open, singing and articulate on my bass. But we all should know by now that when it comes to bass strings, patience is a virtue that has its rewards.
So after only a week: on my bass, Oaks are the "stronger" string of the two and by a large margin. They are louder (A LOT louder) and have a thicker, more authoritative sound in general. Notes are "broader". In spite of the thicker gauge, they seem slightly less tight than the hybrids. The tension feels balanced across the set.
The above goes for both Arco and pizz. And while I shouldn't be the one to make any comment about gut sound because I've never played on guts, I know the sound from the jazz and (older) classical recordings I grew up with. The Oaks sound is definitely more of that kind of a sound but stops short of it, I guess because they are not guts...
Anyway, I really dig them and I think I will end up loving them. The regular hybrids had not really changed in 2+ years and in fact may have gotten even better - so I have every reason to expect the same from these Oaks. All this is from somebody who LOVES the hybrids - they were the answer to my prayers really because they were the first string that truly had no compromises arco/pizz and didn't make me miss any of the other strings I've liked and used thru the years. So I didn't really NEED the Oaks. But curiosity finally got the better and I had the duckets. And I do prefer thicker strings...