Leadex (I) Gold / Platinum aren't really quiet in comparison with most modern PSUs, Titanium is, all good. EVGA P2/T2 are also effectively the same things as the Leadex Platinum and Titanium.
Leadex II is discontinued so it doesn't matter, you get something similar with EVGA G3 tho, it's good too.
Leadex III Gold is fine too, ARGB versions or not, Pro version or not. They've used 22AWG wires in PCie cables after the first connector tho, so don't use it for mining or any other kind of continuous load usecases (gaming is fine).
Leadex III Bronze may be decent but there are no reviews on it, it looks like EVGA B3 was the same thing tho, which had some QC/QA issues so yeah, maybe it's good maybe not, skip it if it's not going into a strictly budget rig.
Leadex V Gold - no reviews, but there's a review for Leadex V Platinum now, after it was being sold for a year in US. And it's not surprisingly a mediocre product, because it's a very compact, 130mm deep high-wattage PSU. Compact size doesn't come free. 1kW version has 103% OPP when it's a norm for high-end PSUs to have about 25-40% headroom there, so it's basically 850W PSU at best, or rather close to 750W. They've also used 20AWG wires in PCie cables after the first connector, so it's a strictly 'gaming' PSU.
Leadex VI - zero reviews, nothing is known about it. Don't buy.
Overall i'm disappointed in the direction Super Flower are going, they had a good start, now they cheap out on stuff, and hesitate to send out review samples, effectively just selling their reputation instead. Just like Seasonic and EVGA.