I expect close to 0 people have owned both to give you a comparison. Maybe 1 or 2 have driven both for long enough to give you a comparison, maybe. A few folks have seen and walked through both at the shows.
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It is not like Ford or Chevy as someone else said. There you are getting cars, made by the hundreds of thousands, from companies who have been making cars for generations. These are low low production units made by relatively new companies.
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So here is a really quick list off the top of my head of some specific questions that would be good for someone here to answer or opine on.
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1) The process of producing a vehicle like this is evolutionary. There is not a single builder who will say that their first build was better than their fifth. So how many of these vehicles, like what you will be buying, have each produced?
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2) How much does the company know about the truck they are selling vs the box they are building. I had an experience with a known high end builder who did not even know how to check the oil on the truck because this particular truck was not one they typically use.
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3) Interior layout philosophy. Where do they put emphasis on space. Where do they do 'double duty' on space. There is no right or wrong, just different philosophy. For example, does one dedicate room for bathroom and shower, or does one double up on that space with an entry? I have found that design philosophy carries through a vehicle, so if you are inline with their philosophy and judgment in one area it will likely carry over to other areas.
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a) One has a higher bed than the other I believe. This makes it possible for one to sleep with the top down if you want, the other I don't think allows this, but by having the bed high, they use that 'airspace' and replace it with storage below. I personally like the storage, YMMV.
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b) Was any consideration given to sitting in the cabin with the top down? Based on how you are built this may not matter. For me not being able to sit straight with the top down is a deal breaker.
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c) Quality of interior construction. You could ask questions of the manufacturer, but a site visit is better. Seeing one after longer term use is best. For the two you have mentioned, ATW is owned by Sportsmobile so they have a history there if you can't find some well used Alphas to look at. Possibly there are some well used EC's in the US to get a glimpse at how they are holding up.
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d) Type of bed provided. It amazes me that even the most budget of budget motels will provide you with a queen bed with decent mattresses because they know that nobody would stay there otherwise. Yet for 1/4 million you get a double bed with a foam pad... just sayin'
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4) Tent sides or hard sides. Up to you which you like better, I think at least the two you mention have tent sides. For me, I have yet to have someone give me a good enough reason why I would chose a tent side over a hard side. But they do defend them! Although I must say tent sides are much less complicated to design and build and likely lighter.
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5) Cubic feet of internal and external storage.