Suppose I’d better post before I’m tannoyed and caught out the back having a fag. 🙂
I’m a long term fan of Portanailers – they’re the original and IMO, the best. However, there are plenty of others out there which seem to be doing the job just as well these days – Powernailer and Bostitch are the two I’m most familiar with. Portanailers have the better mallet – much less recoil from the grey rubber than the white rubber in the Bostitch and Powernailer.
Personally, I wouldn’t bother with the pneumatic – I don’t know anyone who uses it. And you still have to hit it anyway (AFAIK). The nailer serves two purposes – firstly, and most obviously, to put a nail through at 45 degrees and sink it below the surface. Secondly, the force of you hitting it pulls the floor together and closes up gaps. If you’re laying solid boards, this is important as they won’t always be dead straight. If you’re laying reclaimed boards, then you’ll find this feature more important than the nailing itself. With the pneumatic version, you won’t have this feature.