4.03 or 4.51?

I'm on 3.20 and decided to update primarily to get M2 support. I don't think there's any reason to stay on 3.xx anymore because everything is already available up to 4.51

Is there any difference between 4.03 and 4.51? Are they both "golden" firmwares or are there more people and homebrew support on 4.03 vs 4.51