Hello Fishing Guy, Twin hulls are more stable on the water , If I was to buy one it would be the size your showing I don't like the smaller twin hulls, And it would have to be alloy boat. The Mono hull in my opinion are not as stable but have more room at the front if have a family, And they want to have a sleep. Twin hulls are more expensive as they have 2 motors when it comes to servicing , And if you go trolling you get water slap under the front of the hull. I am not a fan of fiberglass boats But I own one, BUT I MUST SAY THEY RIDE MUCH BETTER THAN ALLOY BOATS MUCH BETTER. So in my opinion if your going for a twin hull 6.5 meter and over and in alloy, Or the mono hull your showing in the pic would be the go, But in all honesty I could talk all day about the difference's day, So good luck with buying and looking. Many more RAIDERS will give there views I am no doubt, and it will be a interesting read. I don't like fiberglass due to fiberglass rot/timber rot which I am doing major repairs on my transom now not a nice job, I like alloy boats much better. And if I buy a alloy boat again it would be minimal 6.5 meter.