I have 1 year experience with forex trading and within this time, I have traded in most of the currency pairs but EUR/USD is my favourite. I don't take much risk with other pairs but when I open a trade with EUR/USD, I always set a big volume. I also trade in metals like gold and silver.
I would prefer USD. It goes high frequently. Everytime I withdraw from PayPal to bank using my bank's online PayPal service, I always see the conversion rates. The dollar flactuates frequently but it is always high most of the time.