I would appreciate any input on these.

CP is more economical, and can be cut to fit any shape pan. (It reminds me of my Applique Pressing Sheet for sewing! They say it can be used for cooking.) It sees to be a fiberglass/teflon sheet, where the SilPat is a mesh coated with silacone.

TIA!

I never used or even heard of CP liner before so I can not compare them. I had my silpats for a long time and they work absolutely great.

You can not cut SP. This is copied from their site:

Caution

Do not use scrapers or brushes to clean SILPAT.
Never cut the SILPAT or cut ON the SILPAT.
Do not fold the SILPAT.
Do not grease the SILPAT. It doesnt need it.
Never use a cut or ripped SILPAT as the fiberglass mesh material could migrate into the food.
Avoid using automatic dishwashers, as they may harm the SILPAT.
Do not use SILPAT with a broiler, a grill, or place directly on the bottom of an oven.

On the CP site it says you can trim the oven liners but I could not find any info on baking liners if you can or can not trim them!

Well, that's my two cents on SP and CP...