The Surtees you can shut off the hollow bottom, the bar crusher you can't. The benefit there is it adds weight and stability when you are either not at planing speed in a messy sea, or let's you smash it apart at planing speed rather than being bounced around.
The quinnies don't have a self draining deck and are a much lighter build than the Surtees and Stabi.
A friend of mine traded his 6.5 fibreglass cuddy for a 5.7m Surteess and both him and I reckon it is a more versatile boat because of the toughness of the Ali. Fibreglass does ride softer though. I have an 18' fibreglass cuddy cab for the kids to shelter in, but I have to be a lot more careful where and how I launch. Really I prefer two people. With his Ali it doesn't matter so much.
Ali does corrode faster than fibreglass rots though.
As someone else said, make sure you get ample power.
My next boat will probably be a Stabi 5m or so. Or maybe a cat of some description. Sometimes smaller is better - less hassle to deal with, cheaper to run and still going most places most of the time. The extra stability is very appealing to me.
I have mates with open boats. I much prefer cabins down south as it provides great shelter from the cold wind and spray. Large open boats are best suited to the tropics in my opinion, even if fishing space is slightly compromised. But it isn't that much of a hassle. Being cold, wet and miserable on the other hand sucks balls.