I'll say something as well. The RS3M 2020 is an awesome cube for its price, and turns and feels like a flagship cube. The WRM is also a great cube, and I mained the PVC Coated WRM all throughout my sub15 quest. There are some key differences however.
The WRM has the same magnet strength as the Gts3 M, which is understandable because the WRM was meant to be a non-ridged Gts3 M. The WRM is also half a mm smaller, and that makes a HUGE difference for me. I don't use a 54 mm cube because its too small for one handed. I use a 55.5 mm cube, and although half a mm doesn't sound like much, it is a make it or break it for me. I also use a 55.5 mm cube as my main (GAN Air M). One thing is that the Weilong WR is now basically useless because the RS3M 2020 is so much better than the non magnetic Weilong. One problem with the WRM is that I don't like the feel of it as much as the RS3M, and although I pick up my WRM once in a while, it doesn't compare to the RS3M, maybe cause its been a while and its old?
The RS3M is a solid "budget" (in terms of price not quality) cube, and I would recommend this to any beginner. It truly is a main-killer for some people, and is objectively better than GAN cubes. The dual adjustment system is an awesome addition, which separates it from other cubes. With a "high tech" mechanism, and found in a cheap, quality filled cube, the RS3M, with all its good qualities, was competing slightly for my main 3x3. The downside of this cube, however, is its drastically different feel from the GAN cubes I main(ed). I average around 8.5, and with the RS3M, I hit an all time low of 11.23 Ao12. This is due to my lack of playing around with this cube, but it is also due to its light magnet strength. I like my magnets medium strength and really loose, which the RS3M 2020 provided. It just wasn't the feel I was looking for.
Weilong WR M: Not recommend because there is an objectively better, similar, and cheaper option on the market.
RS3M: Recommend for beginners; not worth it for those who are already locked in with their main.