There is a lot of good choices out there now, so it depends on what your needs are and what your budget is.

Here are my experiences:

1. ARB single (I currently use): Currently hard mounted under the hood and controls my lockers. Very good compromise for size/weight and power. It fills up my 34's fast enough that i probably will never replace it. The ability to run it on a accessory switch panel or factory switches is a big deal to me. Very easy to install and very clean. I probably wouldn't go bigger than a 34 inch tire though.

2. Vlair 88p: good for 33's and smaller. It does take quite a while for it to fill up a 33. I probably wouldn't get this unless you are on a budget. This was my first compressor. .

3. Vlair 400p: I like this alot. Only reason i replaced it,was I went with ARB for lockers. My buddy who now owns it, eventually hard mounted it under the hood. It is much bigger though and quick enough for 34's.

4. shittybilt: okay this is actually pretty dang fast. Only thing i didnt like was it didn't take the same hoses as the ARB hose kit i already owned. Also its pretty huge.

5. Lasfit portable air inflator: I am actually thoroughly impressed by this. It probably is just as fast as my ARB single. Very small form factor, and can be moved from tire to tire or vehicle to vehicle very easy. Can use the dedicated battery pack or run continuous via a cigarette adapter. This is what I carry as a back up or I lend to others to use.