Emmamia,
The old half of my garage was poured in 1963 and used as such until it was re-modeled and the new half was poured in 2000.
I cannot speak to the current garage floor coatings nor prepwork. A professional did the prep work and poured (?) the epoxy floor before the re-modeled garage was put to use.
At the ten year point the old side had areas of failed paint particularly under the heavy SUV parking slot. The sporty side with a car lift and all the use of floor jack, engine stands, etc. still looked good without failure. At the 22 year point the old side continues to slowly deteriorate, but is mostly there. The new side shows the patina of use and very few small spots of epoxy failure.
In my limited experience, I would say that the key step is the prep work on the concrete floor. Good luck.
Warmest regards, Chuck Engles