on whether 72 hours PR and quick-set corrector matters to you or not.
Another thing to consider is the aesthetics of the movement layouts, which are significantly different between gen 1 and gen 2 (discussed here: https://www.watchprosite.com/a.-lange-and-s%C3%B6hne/zeitwerk-movement-gen-1-vs-gen-2-aesthetics/10.1453261.13597396/1639865443/)
Gen 2 will also have slightly thinner bezel and lugs (just marginal difference), even though case dia/height remains the same (41.9/12.6 mm)
For me, I always wanted to have gen 1 (140.029), so that's what I ordered recently.
Good luck! 😉