I use the Oztent King Goanna Chair which I find very comfy. They are high at the back which gives good head support, they have a strap behind the lower back of the chair which can be adjusted to give excellent lower back support. The arms are nice and wide and as a bonus it has two can holders which are perfect and a couple of small pocket type holders. They are not exactly the smallest chair packed up but I find that they sit nicely behind my rib bed.
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But then I thought I would go more compact in order to save more space and purchased a Vango microlight tall chair. It is nice and high at the back which is good for head support and they are quite supportive on your back, I do however find that they lean back which is good for lounging but not so good if you wanted to sit at a table. Generally I find them comfy but there is nowhere to put your arms luckily for you maybe but not me as I have already purchased them, they now sell them with arms which I feel will help a lot with the general comfort of the chair. They are very lightweight and portable but are also strong.
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Of course the difference in packed away size is huge but you do trade some comfort for size. It depends what is more important to you.
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The Oztent are 105 cm x 20 cm x 20 cm.
the Vango are 50 cm x 15 cm x 10 cm.
Of course purchasing the other chairs has now ended up with me wanting to take both sets of chairs so taking up even more room. The Oztent ones for lounging about on site and the others to keep in the van for when we are out and about as they are so portable and still comfy.
As they say the choice is yours.
Hope this helps.