The title says it all. What should I use?

depends on your experience with computers

zmud for noobs
mushclient for broke noobs
tinyfugue for the geeky freaky *nix ppl

uh, dunno for macs didn't see that part ;D

Lol

Nexus

From what I've heard from Mac people before, Nexus is usually what everyone seems to use for sure.

Have to talk to them to figure out how to script and stuff like that with Nexus, because I sure as heck don't know how they do it.

Use tintin++. It runs in a console but has insane scripting power and uses virtually no resources. Also if you use it with mudbot and LMapper it has a automapper better then zmuds imo.

If you don't know Lua, you get Nexus. Or Boot Camp. I highly suggest the latter, since Macs still don't have as many good programs as PCs and you'll want it anyways.

Or TinTin++. I really suggest you use TinTin++. Nexus has nothing on tintin.

I used Atlantis on my Mac until I got leopard and Bootcamp. Veonira I believe pointed me in its direction and it was pretty simple to figure out, so may want to ask her about it for more detail.

Mushclient works supposedly with a wine setup, but not sure on those details either, better to just get bootcamp.

Atlantis is good unless you're interested in combat, in which case my advice is to not spend any time on a system. I had started one, then the first time I got in combat it basically just...frozen until a few minutes later by which time I was dead (twice) and conglutinated.

TF is the best for Mac, but it's best if you either have someone give you a system or know about programming, without using boot camp or parallels.