3 names; Makita, Milwakee, Dewalt. OK, I'll toss in another Skill. As far as grinders go they are high RPM, great for removing large amounts and cutting , not good for polishing or sanding; hence the name grinder. As for sanders or polishers they are low RPM. There is no in between multi tool here. You pay for quality here and depending on your usage that should be the guide. I have a random orbit buffer polisher that I use on the boat that I got from AutoZone several years ago for about $50.00, works like a champ and it's used about 8 -10 hours a year. Would I buy that if I was doing more than that, NO. On the other hand I have a Milwaukee 4" grinder that I use regurarly for tuckpointing, tile, welds, cutting steel, you name it. It is closing in on 20 years (only replaced the brushes and the switch).
Nik