I can’t really speak for long term reliability, but yeah I’d much rather get a rep with something more akin to a clone 2824 or 2836 (not a big fan of miyotas). I recon in 5-10 years when it come time to service, I can afford to get another decent a2836 and just have a brand new movement. Then again, depending on the exact watch, something with a display case back is going to be difficult for a number of reasons, and you’ll end up getting a rep movement too.
I guess it really depends on how long you intend to keep it, you certainly can’t bring your rep Rolex movement into many shops and get away with it (besides maybe the trusted ones on here, don’t have experience myself) so maybe 2-5 years? I plan on keeping mine in good shape for a decent time and wearing them, so the piece of mind that comes with an off the shelf movement is what I’d steer for.
But like Glaude said, the watch is always going to win, especially if it’s a top grade with a rep movement vs a barely passing $100 bargain with something more typical.
One cool exception would be to go quarts if the watch allows, but that’s not too typical nowadays.