I think you mean Monero's tail emission.
Yes, they are fundamentally different dynamics. This is a good point not a lot of people appreciate. I personally prefer gold's emission mechanics, and have actually (roughly) figured out a way to emulate it in cryptocurrency, but which is ideal is still an open question. A flat rate per block seems like it could maintain security adequate for the value secured perfectly, but it does nothing to smooth purchasing power (aka price) shocks. I don't know that that is necessary to do though, I think it is but empirically nobody knows yet.
What I am certain of though is that a fixed supply necessarily leads to a collapse in the security model down the road.
