For outdoors, definitely a wet/dry vac. Wouldn't matter which one as long as it works. For indoors, like my grandparent's old mobile trailer that's seen better days, either a Shark or any vacuum I personally don't care about. Coincidentally, I'm about to be given some machines from my aunt next week she doesn't want anymore and one of them is a Shark that I'm planning on using for the mobile trailer anyways because I've been meaning to get a vacuum in there for a while now. Dusty, dead flies all over, rodent feces on the floor, etc. Just stuff where I don't want to use my nicer machines for like Davis. So the Shark and/or whatever I'd get from her would be excellent for that (except the Rainbow cause that's a nicer machine).