THE most sealant [beads] is good right?
That depends on whether you like beading as opposed to sheeting. I myself like beading, but many here prefer a product that sheets water (i.e., the water runs off the vehicle instead of sitting on it in the form of beads).
Neither/both! Heh heh, sorry, don`t mean to be a smart [aleck] but that really is the answer. "Cut" in a compound/polish is the same as "grit" with sandpaper, just a measure of how aggressive it is. If you want to abrade away a lot of paint you do want plenty of cut to be time-efficient so in that case it`s "good"; if you want to be more gentle and take off less paint, then cut is "bad".
Eh, I guess it`s like a lot of things...first you figure out what you want to do and what you want for results (and, IMO *why*) and then you pick the best choice(es) for that particular job.
My *real* advice is to study up so you know this stuff backwards and forwards. But I understand that not everybody`s gonna do that, so maybe a good get-into-Detailing approach might be to think on this:
-Figure out how to wash/dry properly
-Look into some kind of Decontamination (chemicals/clay/"clay towels/mitts") to get all the [crap] off your paint
-Investigate All in One products, they do a lot with one step (i.e., clean/lightly polish/minimally protect)
-Decide what you want for a Last Step Product ("LSP", i.e., wax/sealant)
I`d leave complicated subjects like polishers, "cut", and compounds/polishes for later consideration. Detailing, at least doing it right, is a surprisingly complicated subject once you start to really look into it, and it can be a lot to figure out all at once.