Your question really depends on what you're looking for. The 2K+ certainly have issues (as do all of them), but from a design standpoint I believe the body wiring and electronics are far better. These electronics are much further ahead and obviously much more current. There seems to be a reduced number of "modules" which can make troubleshooting easier. Problem areas such as bad grounds are very infrequent. GM has located grounding splice packs (ground busses) in locations that are much less affected by moisture. Whenever we hear of electrical problems, everyone seems to jump on "check for a bad ground". While this may be true pre-2000, this is seldom an issue with the 2K+.
The down side are still things such as water leaks, rear window regulators, intermediate steering shafts, etc. The intake manifold gaskets however are common between both.
Parts for both are generally readily available, but obviously you won't find much 2K+ in self-pull yards. You can expect to pay a little more for the newer items as well. There are more issues that require a Tech 2 in the newer vehicles, but again, depending on what you plan on doing mod or self repair wise it may be a non-issue.
StingRay Bike w/cards in the spokes, Weeeeeee!