I like any of them that don't have a latching style trigger. Some of those really inexpensive ones are hard to turn off, that can be bad.

I have an Hitachi Angle grinder, works great and it’s been through some hard jobs. I’ve owned a few brands and it’s been the best one I’ve used.

Metabo or Milwaukee here for years without problems

I got tired of changing disks to cutting wheels to grinding wheels etc, while working on a metal fab project so I went and bought several Harbor Freight Ones for about $15 each. Each has a different accessory and saves a lot of time and effort.

I figured I could throw them away and not sweat $15. They have been used and abused for well over 10 years now.

The new ones have crap Switches. Sneeze and they pop loose and you have to latch them again. I would prefer a simple trigger or a switch that stays on no matter what. Instead they have millennial switches. They quit working when you need them to do their job the most.

Dewalt here too. No issues. Use fairly often.

i bought three well used dewalts at a swap meet maybe 8-10yrs ago, and they have worked great. the same guy had two more that didn't run, and i should have bought those as well just for parts.
i also have a makita, and it works great as well.
i have different wheels on each. makes a fab project so much easier.

To have at least two, one to cut (only) and the other one to grind or flap disc, and/or wire brush, is also how I roll.

In the mid '90s I bought a 9 dollar harbor freight for one job, thinking I only needed it for one job and it could die after that, and I wouldn't care.
That stupid thing kept going forever and finally died last year.
Only thing I did not like about it is, it had a latching feature that could lock the switch "on": no bueno...but it got the job done.

For an extra I tried a another el cheapo from menards, about 9 dollars.
That one did not disappoint, and died a couple months later as expected.

So last year I ended up replacing both of those clunkers with Metabo products (which seem to be Hitachi at the core).
They are okay and haven't had any issues with them.

I have some older Makitas (20 plus years old), and they’ve held up okay. I’m not sure if the new ones are any good.