I dip into both systems. I use the Xbox for simplicity. I used to work for Xbox as technical support so I got to know their systems and that's why I ended up buying an Xbox. But I enjoy my pc a lot as well. Just depends on what I want to play.
I love FiveM. My community created a custom coded RP server and I am loving the amount of roleplay you can get out of this engine. The police cars are sexy as hell and the immersion is great.
TEAMSPEAK all the way. I know it's outdated but It's just the way I am used to communicating. It's on my servers under my own DDoS Protection and using my default port. Just easier to keep an eye on things and know it won't be affected by a down community server.
I definitely prefer dark themes. But I like dark colors outside of websites too so it may be biased. I just dont like how bright light themes are. Its harder to read,