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I use Datamaster for OBDI. Haven't seen a system that works for both OBDI/II.
Im using Datamaster right now to tune my new engine. From what I have heard on the various forums its one of the best for OBD1. Its also free to try for the first 20 times..Link Below..WW
+1 for datamaster. Here's a screen shot showing the results of what I'm pretty sure is a vacuum leak affecting my idle. You can see the IAC trying to compensate and the lean condition. There's lots of data available and the shop manual has info on normal values.