I'm shocked no one has chimed in yet... I personally don't have any experience with a 208 Adventure nor have I ever stepped foot on one before but I do currently have a 2004 Grady White 228 Seafarer. My previous boat was called a 21' Arima Sea Ranger, which is a 21' walk around that also had an 8' beam but it was a lightweight boat, it had a modified vee, all of the weight was in the rear so it would pound like crazy in the 1'-2' chop and it had a motor well built into the stern for the outboard. I wanted something bigger, heavier, nicer and that didn't have a notched or open transom on the back like my Arima did. For me, the ticket was the 228 Seafarer and I actually spent just over a year trying to find one, which I finally did last October. The reasons for liking the 228 Seafarer and wanting to buy one is that it's a bigger, heavier boat, it's hands down a much nicer boat than my Arima, is way smoother in rougher seas, it has the fully enclosed transom on the back of it with the transom bracket, it can fish 4-5 people no problem, you can overnight in it if you wanted to, it's an extremely versatile boat and it's very trailerable by yourself as well as can be captained/launched/retrieved by yourself. It's pretty easy to tow, your pickup should have no issue with towing it and is even easier when you have a buddy to help out.
The boat has a good deal of room on it, although it is slightly narrow in the helm area if you have two larger guys sitting in the helm seats, and I like that it has an all level floor without any steps or stairs in it like the 232 Gulfstream and bigger. Mine also has the hardtop option on it which I really like because I have a fair complexion and it keeps me out of the sun and other elements all day. It seems like most of the older 208 Adventure's for sale don't have the hardtop option on them. The 208 Adventure comparatively has the open or notched transom, which I leave my boat on a mooring buoy in front of my beach cabin for weeks/months on end and like the idea of having the fully enclosed transom as opposed to the 208 Adventure. Lastly, the pricing on the two boats is oftentimes very similar in that you can typically get a 228 Seafarer for not much more money than the 208 Adventure. I bought my boat, motor and trailer combo for $26.5k last October and I can't say that I've seen either a 208 Adventure or a 228 Seafarer that's the same year or newer in as nice of condition as my boat for less. Not trying to bash the 208 Adventure, a lot of guys have them and seem to enjoy them but I'd try stepping foot on both boats and see which one you like more.