Amtico is an excellent choice for marine flooring as it has dimensional stability that no wood product will. I used many vinyl products during my career as a flooring contractor and can vouch first hand for the quality of the Amtico products.
Bamboo which you mentioned, would be a very poor choice, in my experience, as it reacts the most to changes in moisture content. Unless you exercise total control over the environment, meaning keep relative humidity to minimal change, you will have a failure.
As for real wood, solid wood, as mentioned before, is normally mechanically fastened, i.e. nailed/stapled down. This would require a plywood subfloor of a minimum of 1/2 and preferable 3/4 inch. Depending on the sawing of the wood, you will see expansion and contraction across the width of the strips. Species vary considerably in coefficient of dimensional change as well.
It is possible to glue solid 3/4 inch wood down, but the protocol calls for short lengths only. Fine if you want a parquet or herringbone pattern but it doesn't look good in a straight laid job.
Engineered wood is more dimensionally stable but will still expand and contract up to .05%. Undetectable across the plank width, but can be problematic in the end/butts joints. I have seen some very visible butt joint gaps during my second career as a forensic flooring inspector.
Engineered can be installed by a floating method also mentioned before. The caveat for this would be that the substrate must be completely flat and nothing can penetrate the floor to pin it to the substrate. I have seen floors where the base shoe molding was nailed into the floor and caused a failure. Dips int the floor will cause hollow sounds. Crowns and dips can also cause the breaking of the joinery systems.
If you decide on wood, a couple of suggestions:
1. Make sure the floor is acclimated to the boat. Many engineered manufactures state this isn't necessary. I state that is BS. Wood is wood regardless of how the the floor is assembled.
2. Make sure expansion space is provided. The power of expanding wood is tremendous. I have seen wall footers moved by wood expansion.
3. If you use engineered, avoid HDF or MDF cored products like the plague. Use only 100% wood flooring.
I'd be happy to elaborate more if you would like. Send me a PM.