Looking for feedback from anyone who has run both.
I have a set of both.

Will either increase the amount of knock the PCM detects?
Pros and cons of either?

Time for winter mods.:
Long-tube headers
Solid or poly motor mounts
LT4 knock module
Mcleod dual disk clutch
Line-lock

 

I'd stay away from solid if it's a street car.

I have energy suspension poly mounts and have not had any major issues. I'm very happy with them. The only problem I ran into was during the install. There was some poly that had made it's way into the sleeve for the engine mounting bolt during manufacture. That made it a pain to slide in the bolt(threads kept grabbing the poly material).