Mesmer ranged build help
Short answer:
it really doesn’t matter what you run in open world pve or low level fractals. Go with what you enjoy and play away.
Long answer:
Mesmer in its current state is a support and utility class. The weapons that compliment this best are shield and focus while mainhand sword provides the necessary survivability and damage.
The meta builds are generally designed for 5 or 10 mamn group content with designated builds. Greatsword and staff are just not that useful in pve content and reduce our already pathetic damage even further.
Expect instant group kicks in higher level fractals if people see you running either (gs or staff) especially tier 3 and beyond.
You really don’t need a specific build for open world stuff in pve. If you are having issues, splice in some knights or soldier gear and take some more support utilities.
Finally if you want a change of pace, try some condition damage builds for open world pve.