If I’m not rushed to join someone I tend to first load into my own custom game in hopes of reducing the chances of encountering load-in issues during matchmaking. This can often function as a quick mobility warm-up too as I mess around for a brief period of time.
I might also load up a Heroic Firefight match to warm-up my aim and obtain the Warzone environment’s daily win REQ packs.
In very rare cases I have used the custom browser to seek an octagon match or some FFA match as a means to warm up my aim.
In many cases I opt to load up a Quick Play match or some other social arena playlist before jumping over to the ranked environment as the means to shake off some aiming rust as well as to enjoy a more casual social match.
There have been plenty of times when I’m intending to play ranked matches that I do end up skipping any sense of warm up prior and go in completely cold. As I mentioned earlier, this is most common if I’m trying to quickly join someone else who’s already waiting on me or I’m hoping I can pair up with them prior to their next match, but also if my time is quite restrictive and I simply want to get some matches in.
I do have a tendency to jump straight into social playlists after the solo custom match if I was intending to primarily sink time into it instead of the ranked environment. This is because I’m less concerned about pre-warming my aim for social matches. I’m usually fine getting a feel for my aim on the fly since it’s just social. I do find myself still treating the BTB playlist this way even though it's now ranked.