Add another "I have the DeWalt and love it" review to the list. I have the DWS779 but I'll probably add the "780 conversion kit" at some point so it has the kerf shadow. It's heavy, but I have it mounted on a Ridgid "MSUV" rolling stand, which makes it much more manageable. Easier to store, and for transportation you just set the handle on your tailgate, then lift the wheel end and slide it in (so you're really only lugging part of the weight).
I've never used the Ridgid saw so I can't compare or necessarily say it's "bad". But I also don't understand when people say things like "it's fine for a homeowner". You can say that about something like a drill, but how do you say that about a saw where the whole purpose of the tool is precision? If you just want to chop stuff up "close enough" you can use a circular saw and save a few hundred bucks. You spend the money on a miter saw because you want precise angles and cuts, and DeWalt definitely delivers on that.
I had a store brand miter saw when I was younger and first starting out, and it was horribly inaccurate. The markings and settings weren't even close to correct, so you had to trial and error some cuts until you got it set just right. And even then it wasn't super consistent. The difference going to the DeWalt was night and day.
I'm not saying the Ridgid is necessarily that bad, but if you buy a cheaper saw to save $100-$200, but then you don't have confidence in the cuts, you actually just wasted whatever you spent on the saw. IMO for precision tools, there's no such thing as "homeowner grade". There's just tools that work and the price reflects that, or tools where someone thinks "meh that's good enough, nobody will probably notice that gap in my trim"