In pve i use dueling/domination/chrono , and i think that’s the standard choice. However, if you’re talking about endgame pve you should just go to Metabattle and take a look there because mesmer in endgame content changes a lot due to his role being the boonhandler.
In pvp i think they still use PU core condi mesmer and chrono shatterer, they should have the builds in the conquest section of metabattle.
As a word of advice, if you like staff you can use it in pve to solo champions and stuff, you just have to trait mantra of pain to compensate the loss of dps from autoattack, but the warlocks hit around 8k crits (phantasmal fury) and staff gives you great solo survivality, i use it a lot.
