But for regular games, I tend to keep everyone on the same XP track. The only thing that throws that off are magic items that grant XP, like Deck of Many Things and a few others that I might pull from early editions. I track XP for the party, typically because I don't want to calculate XP right after I finish a session and would rather do it at my leisure.. and that resulted in people getting lax in XP recording. I could say, ofc, "if you're not recording it then oh well" but it's not much trouble for me to track party XP.