Single bets are generally better than multi-bets basically because you only have to win one in order to win your bet. Whereas, in a parlay, you have to win 2 or more bets to win your bet. That alone explains why single bets are better. The odds further show you that. Parlay gives you considerably higher odds because it's harder to win. The chances are low, risks are high, therefore, rewards are also big.
What's the difference in managing to win two single bets and two bets on the same parlay?
Statistically speaking, betting on the single matches and one full parlay in the end you will end with the same results, you will of course lose more parlays but the increased odds will get you to near the same result.
I did this
experiment here:
Total after all rounds and 327 games
- Individual bets balance +13.44
- Multiplier balance +2.58
Parlays vs single bets over 30+ rounds, almost no difference!