From what I know aren't teasers a bit easier (or at least, less riskier) versions of parlays? I rarely play parlay but at the very least, compared to how teasers were described (and what I've read so far) I reckon parlays are way more exciting to play with compared to teasers. After all in most cases, the greater the risk the greater the excitement it can actually bring. It also includes the fact that you play around what was given to you, so the thinking/strategizing part also kind of pushes you to think carefully, adding more excitement to it.

Granted I've lost most of my parlays hence why I rarely play them now lol.