I'm a huge fan of the multi bet. Especially if you closely follow a sport. I feel like I can hit a 5 game parlay with much better than the odds presented based on how much information I consume regarding NBA basketball. I frequently make tiny bets, and while most of them are in fact losers, I win with a much higher % than the odds I am given. 1 large parlay can make up for weeks of losses with a very small bet. Everything to me is risk reward. I don't want to take a risk to double my money, I want to take a risk to 50x my money. If it's an educated risk, all the better.
People have their own ideas about what the best strategy is. In both cases it is important to use some sort of bankroll management to ensure that you don't get upset. With a multi bet you can have a lot of fun for little money. With a single bet you have to get everything right but you only need one match. It is mainly a matter of taste, there is no such thing as good or bad in this situation.