RE: Wich recoil pad?
 

Limbsaver works better. Decelerator looks better.

A little Armorall on the Limbsaver eliminates that 'sticky' feel.

RE: Wich recoil pad?
 

I've had a Packmeyer on one of my rifles for many years and it has held up very well. There was a significant difference in felt recoil. I have not had any experience SIMS.