Angle grinders are cheap and disposable. Get whichever one feels comfortable and safe in your hands.
Personally, I like German Metabo, DeWalt and Makita. Fein makes an excellent grinder, as well as the old Hitachi.
In my personal collection I have 3 or 4 of the Dewalt DWE402, 2 or 3 6" Metabo, a 7" Metabo and an old Makita rat tail, as well as an old Hitachi that won't die. My cordless is a pair of 6" Metabo, by FAR my favorite.
I will only buy paddle switch grinders or triggers. No switches, they tend to run away if they get caught. I also can't tell you the last time I used a grinder with the guard on it, but I won't knock any one who uses one.
The Metabos have a good clutch in them if you pinch a wheel or get something caught it won't just jump out of your hand and go nuts.
I use the Dewalt DWE402 dang near every day at work. I use it almost exclusively one handed. I removed the safety catch from the paddle switch so I can pulse it. It makes it a bit of a hair trigger, but I prefer it.
I have never had any of the issues IndyGarage has had with it. I really like the ergonomics of the paddle and how the barrel of the grinder fits my hand. That is the sole reason I use that Dewalt, so that I can quickly deburr or knock down an edge with it one handed. I also have pretty big hands, so grip never really was a problem. When I had employees they all loved them for how small they were and easy to handle for deburring tubes and sheets before welding. They're too small to use for any real metal removal, that's what bigger grinders are for.
The welding shop I manage right now has all Metabo and Dewalt stuff. These guys put them through the wringer and they last a long time.
Grinders are one of those tools that you need to be confident and firm with. They are dangerous if you're afraid of them or use them wrong. Know how the wheel is going to interact with the work. Stand in the correct place. Wear safety glasses and gloves. Get a good, firm grip on the handle and use it intentionally, not timidly. Have a plan for when things go wrong. Ask yourself where will the sparks go, how will the grinder pull if it is snagged, what would happen if the wheel disintegrated. If you use a grinder with these things in mind, they're very safe. If you have a limp grip, allow the wheel to overcenter or snag corners it's gonna **** and you'll probably get hurt. I've seen more hoodie pockets get wound up in a grinder than I have ever seen with any other type of clothing. Lots and lots of people don't think about where their sparks are flying and either burn holes in their shirts or start the trash can on fire or something.
Wire wheels throw wires. I always wear gloves, glasses an a face shield with those things. No exceptions. If I have a lot of it to do, a leather apron helps.