u/AbareKurgan

The endo-sym armor. It's a liquid metal symbiote with some life of its own.
This armor can do what all armors after this do, people say prime armor is the best because it could adapt to different situations... Well, this armor too, and better.
The only armor that felt at least better in some ways was the holo armor, aside from that, all armors just feel like they do the basic stuff.
It's funny because this is like the T-1000 in Terminator, with many similarities (including color and texture), in the sense that the T-1000 also felt like the top of mountain and everything else they tried to do felt worse than the T-1000.

The only ways in which I see an armor being better than this one is: 1. No armor (Tony becomes living tech), 2. Liquid metal + holographic armor. 3. Cosmic Cube armor.