It's Textual, unless somebody is willing to testify otherwise. Textual is infinitely better than LimeChat, in particular. It's probably better than Colloquy, if only because I tried Colloquy but now I'm using Textual. XChat Aqua is buggy and broken.
LimeChat is basically a UI disaster. I ended up hating it whenever I wanted to search the comment history. I have never been annoyed by Textual. It's just nice. I haven't used Colloquy recently enough to remember, but there was something about it that made me switch away. XChat Aqua would be missing random characters from users' names in the user list.
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[ 3.1 ms ] story [ 33.4 ms ] threadiTerm2 + SSH to my VPS + screen + irssi
It's my client for ALL my OSes, and it's consistent/persistent across them. :)
Of the two, I've had a better experience with weechat.
LimeChat: http://limechat.net/mac/
Textual: http://www.codeux.com/textual/
Colloquy: http://colloquy.info/
WeeChat: http://weechat.org/
IRCCloud: https://irccloud.com (web-based, invite/beta)
I've been using Colloquy, but I'm open to trying other apps.