I've used mostly wood floats for my float planes and have had good luck. Most of mine were built from kits and I have covered them in monocoat and some in light weight fiberglass cloth and painted them. I had a set of plastic ones once ( not the ones you listed) and didn't care for them at all. Sig still makes a decent set of wood floats:
Hangar 9 makes floats and they are junk for what they charge in my opinion BUT if you can pick up a busted set or a set cheap, you can open them up and make them stronger and have a good set of wood floats.
Really depends what type of plane you are outfitting and how strong they need to be versus light weight.
I have a set of wood floats that I glassed and then painted with rustoleum . They have been on my Senior Kadet for several years and they wear very well. Only thing I had to do was respray the bottom from shore landings !
You can also get styrofoam cored floats and cover them in lightweight glass and paint them.