Olybirds speaks with much wisdom. He and I have been on rough water in one or two of these models of which you speak. The other thing on the Parker is the gunnels are quite low compared to the others and can be a bit unnerving in the rough stuff. The gunnels on his boat hit me at the waist, on the Parker we fish tuna out of once in awhile, they hit me mid-thigh or lower and I'm only 5.8". We do have a buddy boat that is a 28' Grady, Oly has fished out of it a few times, I haven't been so lucky to connect schedules. Rough water, Grady hands down. The last trip out in the Parker we crossed the bar easily 45 minutes ahead of them as they got hung up waiting for ice and bait. We pushed hard to beat them to the grounds, after maybe 50 miles they reached the tuna grounds as the same time we did and we were flat out flying. The wet rough ride in made me very glad to be in a cabin, however, the bar was huge with 10 footers and very angry when we crossed an hour and a half behind them, it was bigger for them.

Grady hands down for ride quality, especially in rough water. Parker for fishing deck, it's a 25' and has a freakishly huge dance floor out back, if you could fit them in the cabin it would comfortably fish 5 or 6 guys, plus it is a true walk around with the narrow cabin which makes it really nice if you got a hot fish on taking you for a walk. But, as Olybirds said, the cabin is very tight on seating and the ride is not as smooth. Grady is a two seater, anyone other than the captain and first mate get to ride the transom seats in the rain, bring your rain gear.

You're going to be limited to what you can find in your price range, which will most likely be an older boat. Gradys age well and hold their value as well as any. Definitely get a survey done by a qualified surveyor on anything you consider. Glass boats can really hide their issues very well under the surface and if you haven't owned one before, you might never see it until it is way too late.