You need to visit some large RV outlets and just look around and find something that will fit into what you want.
There are no real comparison charts because everyone is different...some want large living areas, some want large bathrooms, bedrooms. Some want an outdoor kitchen, others think they are a waste of space. Well, you see where I am going with this.
Find a good dealer and then just go take a look at what they have. If you aren't sure you will like this lifestyle, purchase a good used, two to three year old model. That will save you from having to fix the things that come from the factory wrong and you won't be paying a premium for "new".