Hi Frogman - gee you ask a hard question.
It all depends on your budget and what style of travel you will be doing. How many in the family?
Our choice came down to understanding that we do long distance travel with a goal/ destination in mind, so we will be travelling every day and setting up every night for a fair part of the trip. This means a hard floor - quick and easy, ours takes 8 minutes.
We also travel severe offroad as much as possible. This means a well built and rugged unit with fantastic suspension - we wanted independent coil. We also wanted the ability to stay remote for up to two weeks - this meant great storage, good water and gas supply, solar power and an anderson plug charge from the cruiser.
We travel with a wife and two younger children - this meant a queen size comfortable innerspring, pumped hot water and a shower.
We needed an on-board fridge freezer to compliment the Engel in the cruiser. We needed almost perfect dust sealing. The only unit we found to meet all of these requirements was the Australian Offroad Camper Odyssey Export Signature at Caloundra - 60 minutes north of Brisbane.
We checked all others out at the Sandown show in Melbourne and nothing came close in build quality (my background is engineering and fabrication) and support/ backup.
Most importantly was the speed of set up. After a long day's driving - you don't want to spend an hour erecting a tent. The AOC Oddy has a quick 'instant' awning for overnight stops. We have it down to 8-10 minutes before the first beer or wine. The kitchen is a masterpiece.
After three years of travelling around Australia with this unit, it has never failed or broken, and even today I have found nothing that I would replace it with....