Seeing the models in person is definitely a key. I don't think I could buy a camper without seeing it for real first. We went to the Denver RV show every year over the course of the last 10 years, and for the years leading up to our purchase (of a used unit mind you) the two camper models out there that fit our needs to a T were the Lance 1191 and a Host (cant remember the model) that had the exact same floorplan (one dinette slide, a side door, big tanks, a rear dry bath, and an open layout. LOTS OF WINDOWS! (another key for us!) We looked each year and when the time came to get one we went with the Lance (it was including the flatbed truck so an amazingly perfect fit for us.)
After we bought it, we continued the tradition of going to the RV shows and until the last couple of years where Lance and others have come out with a rear slide with a couch, not a single camper we saw would even tempt us to go with a different camper. After 7 or so years and 450 or so nights of camping, we now live in our 1191 and are still very happy with it.
It is all about layout and how you expect to use it.
It fully works with the slide in, though 95% of the time it is out anyway. This is nice but isn't a dealbreaker to us. The cat likes it better with the slide in because he can jump on top of the slide, and he likes to do the army crawl, upside down under the bottom of the slide. But he gets no say in the matter ;)
In fact, most of the individual options are not that big a deal.....it was layout more than anything. The tanks are good size for us 45/38/37 but these sizes change over time and sometimes even get smaller. Our model year is 2006 though so I am sure it is different now. Big tanks were a relatively big requirement.
Dry bath, all about preference; I'd guess the more long-term camping you spend in it, the more important the dry bath probably is. Truth be told, the wet bath is often easier for a big guy like me to shower in, but having wet clothes or rain gear, wet ski gear, or even just extra storage when not in use is really useful. Hanging clothes to dry in there is good too although they don't dry well fast here in the east. So I'll put up with the tight shower in exchange for it. Dry baths take up more of your floorplan for a bathroom too so make sure you want one.
I would also really want the 30# propane tanks (2)....since we winter camped a lot. In the summer, unless using the generator much (they are a propane hog) we can go months without adding propane, so for summer only, maybe not a big deal.
Our Lance has overall held up very well, through a TON of use and abuse. Heck, it went to Argentina and back on a bruiser of a truck. I know all brands can have issues, but there is nothing we have experienced with ours to be anything less than satisfied.
Good luck in your decision; I've certainly known at least one really happy camper with his adventurer, but that was also a model from at least 12 years ago so not really applicable either.
If you are going through a dealer somewhere, don't forget you are also shopping for dealers. Make sure you are comfortable with the one you use, regardless of brand. They are super important both for the PDI stuff/sending you out the door, and service after the sale especially in warranty issues. If a dealer has been with a brand for a while, that is probably a good sign. (We bought ours used and have never had to really deal with a dealer at all, but we did also have a very big Lance dealer nearby just in case, which was some good reassurance.