I have 2 Scupper Pro(2-hatch versions) here in California & in Hawaii I have a Scupper Pro(tankwell),a Fiberglass Cuda kayak, & an inflatable.
The scuppers are great touring kayaks & their shape, while wide, offers very decent hydrodynamics. In the Past nationals, 95% of the divers used scupper pro's(a lot of that due to the rentals used). Here in Cali, it's still about 95% of competition divers use scupper pros. They really are that good & versatile!
The smaller ones are great for easy entry & exit, but the comfort & stability of the longer ones is hard to pass up. It's also nice that you can fit everything inside the hatches(important for me since I often do acrobatics coming in through surf).
One of my dive partners picked up Ocean Kayak's new Prowler & it's a great kayak, but not enough that I'd want to give mine up.
Diving from Ocean Kayaks is great in that they're really stable, so it's easy to get in & out of them. Even with a 20-pound weightbelt & 7mm suit. They're durable as heck & you can patch any freak accident with a heat gun. I haven't had to do this yet, but have helped others & it's pretty easy.
There are many factors that would influence what type of kayak you buy. It would help me(us) assist you if we knew: how far you're planning on travelling with the kayak? any turbulance at all or primarily flat waters? driving or walking to the river?
Cheers.