I'm gonna go to bat for T2 over Terminator 1 here. Aside from being the more popular movie, time travel feels much more relevant to the central theme of the film. Being able to change the future/the future is not written in stone may not be some unique insight, but T2 deals it with more than the original from what I recall.
Congrats on Advokaiser for winning the 2018 Guru Contest!
Yesmar