Preferably you should go buy the games and dump the copy you own as piracy is against the forum rules.
Aa for the question revision = version, no revision means it's basically version 1.0
As for which version to get is debatable and unknown as revisions can bring fixes to the glitches that were found in the original version but they could also just removed some things or changed something for one reason or another.
For example Tom Raider 1 has 6 different revisions with the only difference that I can tell is what extra demos it's packed with.
So unless you have a specific need to use a specific revision it doesn't matter which one you'll get.