saturated plywood will work great for years and years. G10 will work great forever. That's the only difference.. besides a lot of $$$.
If I may make another suggestion. When bedding something that exposed to light (ie not a backing plate in a anchor locker) I'd highly suggest 3M 4000UV. It still has good bonding characteristics but doesn't yellow in the sun like 42/5200
btw JD is cheaper than McMaster for g10
