I am creating a template for some birch plywood that is 12X60. I can get MDF or Premium Melamine. My question is, since the template will only have 1" in each side, which is stronger? I may widen the template to 14.5" for an extra 1/4" but wonder which of these two will work better and last longer while not being used. I know I will have to be real careful whit it when not in use, thin sides.

Any help appreciated.

Chris