Which Wasteland is a better game?
Good question.
In my opinion, original Wasteland is one of the best RPGs ever made, one that manages to still be fun and original in so many ways. Its story is pretty good to this day (though nothing mind-blowing), whereas its aesthetics (as minimal as they can be due to obvious reasons) are pretty cool. Gameplay is...entertaining, if you can get used to it. It is also a fun part of the experience when you compare and contrast all the various details that would later be reused or remade in Fallout.
Wasteland 2 is far more accessible than the original game, but I think it is an inferior title. Its story is a rehash of W1's story, gameplay is a blander version of XCOM Enemy Unknown and it has many faults in its design that hinder the overall experience. It isn't that good in graphical department either (if you care about that), but is great aesthetically and hits that 80s retrofuturism sweet spot.
I believe that most people (including me) would consider it a better game were it not hailed as a messiah of old school RPG renaissance - in reality, it's a mediocre-to-good game.
To conclude, I personally think that Wasteland is a better game than its sequel, but because of the time and tech difference between them, such comparison is actually problematic. This is not a case of Fallout vs Fallout 3 where two different developers made two games of the same name. These are the same people making two games under the same moniker - that are very different in many ways, yet one is the obvious successor to the other.
If you wanna have the whole experience, play the original first - story of the W2 is a continuation of the original game, with many characters returning. GOG (and Steam I think) host the new updated version of the game which is the same as the old one with few quirks here and there to make it more accessible for new audience and modern machines - its still the same experience though.
On the other hand, if the only thing you're looking for is 80s retrofuturism, go with Wasteland 2. Director's Cut, preferably (DC contains very few, minor improvements over vanilla - the reason I'm recommending it over the other is because it is a more stable version, or so I've heard).
tl;dr
Play the original. They don't call it the godfather of post-apocalyptic RPGs for no reason.
If you can (not) handle it, play the sequel.
P.S. Don't edit your initial party in Wasteland. It's a flawed party, really, but it adds to the experience. You'll see.