You mention a "more open cockpit 223" in your post. I assume you mean a 232 Gulfstream like your thread title says? I will go with that in mind.
I had a 2007 232 for 11 years. It's an incredible 23 footer. I know nothing about fishing, so I can't help you in that regard, but the boat should measure up to and probably beat your older Stratos in most categories.
If your primary area is the Chesapeake Bay, you'll enjoy life aboard up to 15kt winds & 2 foot seas. After that, it gets unpleasant but by no means unsafe. If your a Hardy Soul who'll go out in all kinds of weather, the Gulfstream will take most anything you throw at it. A well-cared for 232 is a Battleship in a 23 foot package.
It sports a 9' 3" beam, making it illegal to trailer without proper permits. It is your personal call as to whether to acquire them or not. Some do, some don't. It is also a significant load to jerk around, best accomplished with a 3/4 or 1-ton diesel. A V8 gas will move it, but you'll live life under 10MPG. My rig loaded for bear weighed 10,100 lbs including the trailer. Yours will likely weigh less; I trailered mine fully fueled all the time. It didn't matter to me.
This, to me, is significant. DO NOT let your seller talk you into an inadequate, or marginal trailer. This is a big boat and needs proper support. My trailer had two 7K axles & electric brakes after I upgraded from 5K axles. I blew bearings and had problems until I swapped out the axles. Overbuild the trailer; it matters.
My opinion, which I am all too often happy to give, is that a Gulfstream needs twins. It is wide for it's length and surprisingly beefy for a 23 footer. Twins will allow it to plane easier, give you more power and control in sloppy conditions and make it much easier to horse around a dock than one equipped with a single. Twin 150's are good..Twin 200's, which I had, are better. With bottom paint, mine achieved 1.9-2.1 MPG depending on conditions. 150's will do a tick better, although not a lot. My rig would cruise easily at 30-33 MPH between 3800-4100 RPM's. You'd be spinning a single 250 at close to 5K to achieve those speeds.
Take a ride on one somewhere. As long as you keep the perspective that it's a 23 footer, not a 30, I think you'll be stoked about getting one.