You have the same
Optoma listed twice (so I'm taking that as
UHZ65 and not the Ultra Short Throw edition) If that is the case, then this rules
UHZ65 out as it cannot perform 3D. As for
Epson projectors, the
EH-TW9400, this is one of their most popular projectors and certainly performs well and easily outshines the
UHZ65UST in my opinion for everything with the exception of 3D as
DLP projectors are historically the class leader behind this, however, the projection that
Epson have made over the years has really caught up compared to where they were a few years ago (with crosstalk) bridging the gap. As for the
BenQ, I have never seen this model in action, so I'm unable to comment on it.
As for Sharpness, logically a single chip the
DLP projector should be sharper than the 3LCD
LCD projector because of the convergence issues that arise when aligning the panels compared to a single chip using a colour wheel, but in reality under normal condition from a standard distance using a standard screen when viewing good quality material, you would never feel short changed with either technology
I know this may have made your choice a little harder, but in reality, if I was choosing, based on overall ability, the
Epson is the standout winner in my opinion for an all rounder and (taking into account I haven't seen the Epson) all the publications shouting about this projector including these AVFourms when they
reviewed it, so this should give you a good idea which one to place at the two of your viewing list