I do understand, and it's fine to learn.

Do you have any experience handling electronics? If not, I suggest reading up on soldering SMT and through-hole components. And one of my favorite books for FPGA's is Embedded Design Using Programmable Gate Arrays by Dennis Silage. Very useful.

Both chips are roughly the same price, aside from the distributors. How many chips do you plan on buying? Minimal quantities will run you thousands per chip. My sources on that one are Digikey and Altera.

If you buy 25k I imagine you can get them at a fraction of the cost, but buying a single chip would break bank unless you're rolling in dough, haha.