I can say that in most cases, the ports are the exact same as the original. For example I grew up with Zelda 1 and 2 on the NES. However when I started my collection, I got the GBA ports. They run exactly the same with no real difference other than portability.
Now remakes tend to have some differences, but the core canon experience remains and the remakes actually end up being the better version anyway.
So it is like this, ports have no impact on experience at all.
Remakes will offer the same experience overall, but there are small differences to the execution at times that might leave people prefering one version over the other (even though the remake is pretty much always better).
That is how I see it anyway.