Everyone levels at the same rate, yes, but do they always get the same xp for everything or do some characters tend to get more than others due to being more involved, luckier, or whatever?I stuck with XP in 5th for a long time until I realized that it doesn’t matter when everyone levels at the same rate.
B/c some OPs are only interested in responses to their post that are in the context of the specific edition they are currently playing? In this case, they are very specific as to the answers they seek: My question is a simple one, in your 5E games, if you use XP awards...As for the OP's questions (which are rather edition-agnostic, not sure why the thread's tagged '5e'):
In our current game, the DMs have been awarding XP per session as long as the party is (and... importantly... the players are) Getting Stuff Done. Absent characters do not get XP.
We do have some interesting (convoluted?) math involved for determining XP quickly. Essentially, we have awarded XP based on one session to get to level 2, two sessions to get to level 3, three sessions to get to level 4, and four sessions to get to level 5.
After level 5, the XP awarded per session will be the total required to get to the next level divided by 5. For example, it takes 7500 XP to get from level 5 to 6, so each session is worth 1500 XP. Once any of the PCs hits level 6, each session will be then worth 1800 XP (since 9000 XP are required to get from level 5 to 6). Etc.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.