As noted in the posts above, give careful consideration to how you will use the RV the most. I noted that you report you are a city slicker. Does that mean you will use the RV a lot in the city? If so, a smaller unit is generally easier to park and move around in the city environment. In some cases, it is also easier to squeeze into some more remote campgrounds. If, as you indicated, it will spend much time in a campground, a longer unit will give you more room for everyday living and relaxing. Generally, storage room will be greater in a longer unit. Good luck with your search.
Bob