My vote is for the Lance 1191. But, I have one and have no complaints.
Since you haven't shared what your plans are for the use of your Truck Camper, I probably shouldn't go into a lot of details about my Lance, as what I am doing with mine might not be relevant to your use. Like btggraphix, tank size and capacities were important to me. My solution was to provide my own solutions to compliment what was already available in my Lance Camper.
Having a slide and dry bath were an important choice for me. As was a side entrance. Again, for my needs. I use my slide out, maybe 3/4 of the time. When it is really cold (below freezing) or when it is really windy (more than 50 MPH), in the desert, I tend to keep the slide in as well as when I am stealth camping.
I haven't had any major issues and the ones I have had, I have fixed myself, while on the road.
Recently I was at the Seattle RV Show and they had a number of Adventurer Truck Campers there and they were spectacular. But to be honest, none of them were an improvement to cause me to even dream of trading mine in for one. Plus there were no side entrance TCs in the Adventurers being shown. (Do they make one?)
No matter what you decide, if you are like me, as well as most of us here, you are going to be happy with a truck camper.
b