To be truthful,neither,they are the weakest part of the DUI suit. I have removed the feet of the DUI suit and replaced them with another manufacturers boot (DiveRite 905). Quite a few people have done the same and been very satisfied.
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The reason I am asking is because my suit was sent back to DUI because the turbo soles were too big (and since THEY measure you for a signature suit, it was their mistake to put big socks on). I've been using the suit for 2 months before I sent it back and I noticed that the fin straps DO slip a bit and can get kind of uncomfortable. My ankles also hurt but I attributed that to new jet style fins that are still stiff. What I DO like is that I don't have to pack or dry dirty rock boots or try to shove non form fitting drysuit socks into boots. I also like that I can throw on any of the fins that I use when diving wet. As long as its at DUI, I thought maybe I should switch the socks for regular socks and boots. However, that also means buying ANOTHER pair of fins =/
Even with springs?