Latex Mattress Issues

What is the best, a futon latex foam mattress or futon mattresss spring?
I'm looking to buy a futon when I move is a couple of months. That I really Ikea (http://www.ikea.com/us/en/catalog/products/S49839894/) mattress has a few options and I want to get one that will be most comfortable and resilient. Price is not really a problem, but comfort is. That they have on display was a foam mattress I think, and it is comfortable, but if anyone has any comments on what is best, it would really help.
I swear by memory foam. If you do can not give a full memory foam mattress, buy a decent mattress for support and put a pillow memory foam on top. You'll wonder why you did not get one earlier!
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