As mentioned, there aren't a ton of outward differences with the 208 Adventure over the years, except for some smaller things like the interior of the cabin cushions, some of the instrumentation at the helm and so forth. I briefly considered buying one instead of my 228 Seafarer over the year that I was looking for a boat but for a few reasons, I passed on that idea. For myself, I wanted a slightly larger boat than only 20' as well as I wanted one that was heavier, would be more comfortable in the chop and nasty conditions, etc. I'd also heard multiple problems from people that had owned them where they'd had water intrusion issues because of the bang cap/plate and water getting into the transom that way. The motor well style of transom also wasn't something that I liked and it seemed to take up a good deal of potential fishing space. On the other hand, I didn't need a 232 Gulfstream for my particular fishing/boating needs as it's a considerably bigger boat and that imo was a bit overkill for myself personally. The 228 Seafarer with the fully enclosed transom, transom bracket, swim step and so forth opens up the boat considerably and gives it a bit more room. The difference in weight between the two boats is also pretty substantial in that a 208 Adventure test boat with an F200 on it had a test weight of around 4,200 lbs whereas the 228 Seafarer with an F225 was at just over 5,300 lbs.
Imo, and yes I know that I might be slightly biased, but it's the Goldilocks of walkarounds between the 208 Adventure and the 232 Gulfstream. Small enough to handle on your own... towing, launching, captaining and retrieving by yourself. But also to where you can take it out in considerably worse conditions than you'd want to experience in a 208 Adventure. And it'll even just handle the normal everyday chop/current/wind considerably better with the extra length as well as the additional 1k lbs of weight. The 232 Gulfstream on the other hand is a completely different beast and one that I didn't really feel the need to buy for the relatively protected waters in front of my beach cabin on Whidbey Island. As mentioned above, I wouldn't get any of these boats without a hardtop, unless it was an absolute steal of a deal, trim tabs also help out quite a bit as well as the outboard being propped appropriately. I've got a 3 blade prop on my boat, of which she'll hit 43-44 mph in perfect conditions and with a moderate amount of fuel onboard. I think the 4 blade, from what others have said on here, is probably the better option and one that would get me slightly better numbers, but I don't need to go much over 25-30 mph and the added expense to me isn't worth pulling the boat out of the water just for that reason. Maybe over the winter I'll give Ken at Prop Gods a call and see what he recommends, but I'd rather put that money elsewhere first. I think the best thing that you can do is to step onto a 208 Adventure as well as any other boats you might be interested in first and see what you think. Is there enough room for you, your fishing/boating needs, gear and so forth? If not, perhaps looking at a slightly larger boat like the 226/228 Seafarer might be the better option?