I own all the above. A metal ring actually feels the best for a long wearing (and I think looks the best) but I'm always sort of nervous that I'll get over-inflated and won't be able to get it off (we've all heard about guys in the ED getting them cut off, probably mostly urban legends).
The rubber rings tend to irritate, so only for a quickie.
The three-snap leather strap is probably my favorite because it's adjustable, and I can pull it off easily before I cum. I like it especially for an evening at the baths. But it can start to chafe if I wear it too long. They all seem to be stable with the silicone lube I use.
Al
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