You will be losing money on either proposition.  There's no point worrying about numbers.

The only way to make money at CEX.IO is buying low and selling it at a higher price (assuming it goes higher).

If you enjoy playing on the websites nobody should do anything to discourage that, but understand that you will be pissing away your 1BTC.

Best choice would be to buy 1 BTC and hold it.  If you want to flip stuff, practice flipping on an exchange.