I'd rather stick with single bets, bets that I know and am confident about. I see parlay as risky and I'd rather get a few small wins every now and then rather than attempting a single big win.
It's also a good idea doing that if you ain't sure about playing this type of gambling it's better to have small profits than trying to make it much higher but the risk also adding up and with one wrong choose your entire bets will ruined.
Play where you think you have a much better chances of winning stop being greedy if you're not comfortable with the games that you are betting in.