I really DON'T like love triangles
It's really unnecessary for me since almost all the time the main couple will just end up together anyway and if they don't then it just messes up the love story just for the sake of some angst or conflict.
Adding a love triangle would just make the hero/heroine forced into a position of choosing one of two people. The circumstance might end up being hasty and choosing a bad partner. I especially hate it when the two rivals pressure the protag to choose. Also, the rivals end up doing a little more than they would have just to outdo the other and that feels so fake to me. Love is not a thing that should be rushed, it simply isn't a good idea to be in a love triangle.
The only way I would consider a love triangle successful is if either the protag is rational enough to not pick either and gains character development or if the two rivals end up with each other instead lol
but it all the depends on how well it's written. Good writers can make bad tropes look good.