Whatever brand you choose, they are wonderful pieces of kit.
I find myself using my little 0.6L Trekker KK much more than the big 1.6L and as I tend to use a coffee maker, there are times when I only use the Hobo for meals and just use the kettle for washing up.
You can do a lot of work with the little one.
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This will easily cook a curry and rice from scratch and do breakfast and coffee in the morning + washing up.
I would agree that if you are in a day trip then a thermos is very much easier. Not so much fun, but easier.