>>2005243>At the end of the day they're both low end aluminum frames without replaceable derailleur hangersThat's not a sign that they're low end, just that they're old. Old Kleins are like that too. Replaceable derailer hangers weren't really a thing yet.
I really like that STX stuff, the smoke finish is cool, but the XT crankset is significantly lighter, the crank arms, and the STX has steel chainrings without an inner spider for the granny.
The 'better' crank is on condition of the chainrings and they aren't interchangeable, but still. The bike you prioritize should get the XT crank if it's useable, even if it pairs with STX rest.
The cantis are pretty much the same just with different finishes.
Imo the place to start would be buying some cone spanners and servicing all of the hubs and see which have non-worn bearings and then knowing which nice wheelsets you have.
That purple frame is really cool imo, although i hate how the rear brake stop works. I normally prefer cantis but would consider swapping to vs on a configuration like that.
The fork looks more fucked on the GT. Are they the same length? You could swap them round. You also might be able to get new elastomers and rebuild either one, or better yet, try find a cheap used rigid fork.
Think they're both 1 1/8"