I bought Ronin-SC, and it actually was the first one in my country

Couldn't be happier.
Previously I used Zhiyun Crane Plus. Few years ago it was a capable gimbal, but since then newer models came to the market and I wanted all those cool features they had. So I sold my Crane Plus and looked for reviews and comparison. And even bought Ronin-S (and immediately returned because of how heavy it is). After that I decided to get Weebill as the smallest one, hoping it will fit my bag with all other gear together. But then, at the same day I ordered a Weebill, Ronin-SC was announced

So I cancelled my Zhiyun order and pre-ordered DJI.
Whie Weebill is an interesing gimbal, it's way worse in stabilization. There are a lot of reviews on youtube and especially the one from a Norwegian guy who tell about it's downsides (and actually owns one). Huge disappointment, I must say.
What I like about SC is that it's extremely compact, has really, really good stabilization and all that cool features I wanted.
As for M2 and G6 - those are good small gimbals too, but only for smartphones or compact cameras. Or something like a6400+16-50, not heavier. My a6400 + SmallRig L-bracket + Sigma 16mm f/1.4 setup weights 1,100 grams. And it's too much for those two gimbals. There's one general rule for Zhiyun and Feiyu gimbals: you wouldn't want to get close to their maximum payload cause they'll get very bad with it. So if it says "900 grams", you'll better not exceed about 600 grams of payload or so, just to give gimbal's motors some breathing room.
There was another Zhiyin gimbal announced few days ago: Weebill-S. With all that stuff Ronin-SC has. But from the first reviews I see that stabilization quality remains the same, with all that bumps and shakiness.
Overall, if you want best and hassle-free experience, just get a Ronin-SC.