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The WRM comes with more accessories such as spare cores, spring compression stuff, etc I think. Pretty useless unless you plan on losing most of your cube or putting this stuff into another cube.
I think a poll would help distinguish between the two
I have both cubes. I’m not really fast but i clearly prefer the GTS3M. It’s my favorite cube of mine alongside my Gan356XS. I don’t mind the ridges and i prefer medium to strong magnets. My WR M is my “car cube” i just keep it there for bad traffic situations. I overshot a lot on it.