differnce in plywood

[77SceptreOB]

In a related thought.....

I'm planning on redoing the transom on "Katrina" in the spring and i am seriously debating the use of plywood vs. composites. So i'm very curious to see where this thread goes and interested in knowledge opinions. So far, I'm leaning to plywood due to:

1) Availablity
2) Cost (about 1/2 the cost of Coosa)
3) Reasonable lifespan (20+ years if done correctly)
4) Workability (with standard woodworking tools)
5) Holds screws better, thus basically reduces the need to thru-bolt.

I do plan to use Epoxy resin, but hear that Vinylester resin is a close second and Polyester have been successfully used too.