It's been said here before, but it's worth repeating: Velvets need a good three weeks to settle in, stretch out, and let the bass relax into their tension. And, as the company suggests, you will probably want to raise your action (assuming you have an adjustable bridge) to give them room to vibrate. I had a Garbo G and a D on my bass (with Anima E and A) and the amount of sound and fundamental that came out of those strings was mind-boggling. A double stop of the open D and A on the G string sounded like a cannon, or like organ pedals on steroids. I cannot imagine a bass on which a settled-in set of Garbos will not make more sound than a set of Obligatos. (But, hey, some people have good luck with Obligatos; on my bass, they were wet noodles.)
). I think i can comment on the bass-to-bass variance of the oblis as well. I had one bass (small late C19th Jacquet) on which a settled set of oblis sounded pretty mellow and "gutty". On my current instrument (contemporary Hungarian - & a much better bass) they are more like spiros. Can't wait to stick garbos on the new bass.