Umm, a few things.
First off, Makita is just one of a lot of tool brands. Every tool maker has their way of making things, a particular fit, set of ergometrics, whatever, so they fit your hands or they don’t. Me, I don’t fit the Makitas, or they don’t fit me.
There is one good reason to go all Makita. As an example, one of my nephews has Makita cordless stuff, and he has standardised on those, one battery type works in all of them. For what it’s worth, if you are doing it for that reason Makita isn’t bad.Nor is Hitachi, my setup, neither maker changes the batteries they use very much.Some other makers change 'em a lot, Porter Cable being notorious for it, seems like they come out with new tools and new battery types every Tuesday and your old tool just became a paperweight.
That’s nice, but the thing is sanding and grinding tend to be something you do for hours at a whack. Cordless tools for that are gonna drive you nuts, you’ll wear a path to the battery chargers (plural) and go broke what with all the batteries you’ll need.
Go for one with a cord.
Now, a grinder. Maybe, maybe not. Grinders are ferocious things and for small repairs it’s kinda like slicing bread with a chain saw or stirring your coffee with a grenade. Doing production hotcoats on a lot of boards, sure, BIG ding repairs at speed, yeah, and I like my Milwaukee for that and boat hull sanding and what have you. I was a pro boat carpenter, I can do that and do it well.
But for a few repairs, not terribly big,overkill, way overkill. Instead, let me suggest a random orbital sander, not awfully big, say 5". They come in two flavors, the compact one hand palm type which suck and those based on a small grinder with the random orbital function as a gearbox built on. Those hold up well and I find them far more controllable. You want variable speed, vacuum dust removal is nice but can be awkward. I myself prefer peel and stick discs rather than the velcro type, you burn through a lot of them anyhow and you rarely switch from one grit to something else and back again which is the selling point of the velcro types.
There’s a few of those out there. And don’t forget the used tool market, in my far from humble opinion the Porter-Cable 7335 was the best going and still is, a real production tool. Light enough to use all day, and I have, rugged enough to take it. I like mine. Parts still very much available. You can even put a polishing mop on it and make things shiny.
hope that’s of use
doc…