I’m from the EU and I’ve been playing Halo for years with my friends which mostly reside in the US. When we all play together on a regular basis, we are always put into US servers (probably because most of the team are from the US). The only issue I have and probably everyone else from the EU is that the player base in the EU is a lot smaller than the US, so we are forced into US servers basically all of the time and then having to deal with high ping. I play 99% of my games at 122+ping and its incredibly frustrating.
I’m just hoping that Halo Infinite can release with optimised servers that can keep ping low for both EU and US players in the same server.