Mendacity RDM weapon or Crafted?

[wereotter]

In this case the 360 mendacity.

Otherwise more immediately, consider Eureka's Anemos rapier. It's closely comparable to the 360 mendacity - general differences will not be eyeballed nor felt easily and thus you can do just fine with preference out of those two.

Or later on the next extreme weapon.

I would agree on this. The Eureka weapon is comparable and possibly slightly better than the 360 mendacity weapon based on substats. 300 DH, 200 DET and the ability to meld 200 CRIT onto the Eureka weapon is pretty good. Mendacity weapon will likely be better once you can upgrade it to 370 since the base weapon damage will outweigh the substats. Also that will give you time, depending on how long it takes you to progress through the floors, to focus on other mendacity purchases in the meantime.