There is no right answer. I prefer 2 point slings, but I have friends that swear by 1 point slings.
Even after you pick how many attachment points you want, you'll have the option (depending on what parts you buy) of where to attach, which is also personal preference.
Lots of guys set up like this, using the front sight sling loop and the stock:
Others prefer to attach the front of the sling closer to the receiver, which generally requires a separate attachment point that fits on a quad rail:
Still other prefer to move the rear of the sling closer to the receiver, like this:
As for brand, I bought a used gun that came with a Vickers and decided I liked it, so that's what I run.
Sorry if this wasn't much help, but there are lots of options and you just kind of have to find what works best for you.