I would also have to say Suse, but I vote for 8.1, with all of the updated software, etc. I have it running on my thinkpad 600. I think the ALSA sound system as implemented in Suse does a better job of configuring the think pad sound systems. And as an added bonus, Suse comes with the Mwave winmodem driver for Linux as part of the distribution, so it worked with my modem right off the bat as well. Unfortunately, I don't think your T-22 doesn't use the Mwave or the HSF (conexant) chipsets, so it won't be natively supported by Suse (or probably any other distro). But if you go here, you may find a linux driver for that modem that may work:
<a target=new class=ftalternatingbarlinklarge href="http://
http://www.pc.ibm.com/qtechinfo/MIGR-4VFTT3.html?lang=en_US&page=brand&brand=root&doctype=&subtype=Cat&up=unknownuser1004106089">IBM support site for T-22</a>
In Suse's set up tool, it didn't recognize my soundcard, but after the install, I used the "alsaconfig" tool (be sure to install all the alsa packages) and it set it up without a problem. Sndconfig in Mandrake didn't get the job done as well, and I had to fiddle around with Modules.conf to get it to work.