From a collector's perspective, the older models with just Tempest on the forend in pristine condition and all original accessories including the box are the most desirable but if you're looking for a user, most shoot equally well.
The trigger was changed to a broader blade in around 2002 and I prefer the feel of these late production triggers as they feel lighter and more comfortable as more of your finger is in contact with the blade. They were only made for a short time before the factory closed, so will probably be rarer in years to come. I have not tried any of the Turkish copies.
John
Currently looking for Baikal Makarov pistols with the following prefixes to the serial number: 98, T01, T09, T21, T22
Prefer boxed or cased but will consider loose examples too.