8gb will run it perfectly ok but I just prefer a 16. Can't see there being a lot of difference in the 2 cards but the faster the card the faster u can put the image on it. Personally I use raspbian and install the tools I need separately. I use my rpi3 built in wifi to ssh in and an external usb wifi for inet access ( or in monitor mode for aircrack-ng etc ). I would be updating to a rpi3 though. Very impressed with it for whst it is.
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