I never met a sound pack I didn't download. I have Mitsu's, Sketch's, Ranger's and someone else's (probably Waffle's). They are all unzipped to a separate folder tree and I just pick which sounds I like best. You'll notice that there are a lot of sounds common between the different packs.
As to the best one, I think my base sound pack is Mitsu's. It seemed to have the highest number of sounds I liked. But a bunch of engine and tank gun sounds have been replaced from the other packs.