Totally agree with Les but I have yet to see a tool that does more "real" sim of Pic devices.

Flowcode removes you too far from the hardware.
The Oshonsoft line of products are limited to input and output types.
WiZ-c with it's inexpensive hardware debugger - if I could do C.
MpLabx sucks the big one.
LabView is much to clever for me.
Tina is a joke isn't it?
I've never tried Psim, perhaps I should.

Anything I forgot?