Pavers or flagstone?

Im in the process or building a fairly large patio in my backyard. Its going to be roughly 40' X 20'. Im trying to decide between some sort of paver or flagstone. If I go with the flagstone it will be "floating", as in no concrete. I kind of like the idea or having a small gap between each piece that moss or grass could grow from. At the same time I realize thats a lot of extra upkeep and pavers would not have that. Pavers on the other hand seem a little more "organized" and "formal" than what im really looking for. I think if i did go with the pavers I would use something that is tumbled and rougher looking.
Can anyone tell me some pros and cons to pavers and flagstone for a patio of that size?
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