I had a Searider Sr4 previously.
Difference in strength of hull, the lay up, is noticeable.
The Gemini is exceptionally strong.
Mine also has a full length metal keelguard - brilliant, and the keel lay up is again, really solid.
Its a wet boat, but mine had to have a retube and not sure if thats a consequence of the re-tube.
I have heard they are quite wet as normal.
When I bought mine, the tubes had gone at the seams, but the boat was almost 10 years old,
and had obviously been well used. All the GRP work was still in great condition though
and didnt look at all like a 10 year old boat.
The Humber has a solid deck top, whereas the Gemini has a collection of deck panels and a bilge.
I am changing the ping pong bailer on the transom, and replacing it with a screw in bung, after it jammed open
I never had the Humber Ocean Pro, I know its a quality piece of kit, but I am happy with the Gemini,
big Deep V hull, just a bit of a wet ride.
I always feel safe in the boat, definitely feels you are "in" the boat whereas the Searider felt
like you were "on" the boat, but then it is over a metre longer than the SR4.
Cant compare it to the ride of a 5.8 OP, as never owned one of those.
Love the keel protection, and therefore the ability to beach it.
hope this helps.