I don't know about other stoppers, have only used the one's Ruth sells.
Her's are top notch so never have had a need to look anywhere else.
Don't see how others could be better in anyway.
YES, they plug the bottle and it doesn't leak when laying on its side.
Her stoppers also allow the bottle (wine) to go all the way up to the wood placed on top of the stopper making them look very nice when in use.
I've only used the original designed one's cone shaped.