Focus for Mirage or Chronomancer?

i want to use focus on mesmer, so should i be mirage or chronomancer which one is better for focus?

The focus for the mesmer is mainly about utility, so you could probably get away with either elite spec. So if you really like mirage or chrono better, just choose the one you like and you can probably make focus work well enough either way. That said, the focus is likely better for chrono. It has some power damage on the skill 5, which chrono benefits from and mirage doesn't usually use much of. Check out the power chrono build for raids on snowcrows for a solid build that uses the focus (https://snowcrows.com/raids/mesmer/). Hope that helps!

Chrono power build, which is meta in PvE, uses focus. The focuse phantasm deals the most power damage after sword phantasm.

Mirage has no use for focus in any game mode.