Hi @tyrese
Since the Version numbers indicate major version changes, it depends on your current integration. If you a starting a new implementation, I would definitely choose the 2.x one. Lower version numbers are typically indicating deprecated functionality that may be outdated and phased out in the future.
Similarly, you may see or at least saw multiple Adobe Target extensions of the legacy at.js which we a major API change between the 1.x and 2.x versions.
Cheers from Switzerland!