I think it depends, like many things, on how well you present it in general. A good love triangle is good and will be tense and back and forth and make me wish they'd all get together but knowing they have to pick one, while a bad one the choice is either reallyobvious or I'll yelling at the MC about how they're both awful options why do you like either or them?!?!?! (Or all three of you are awful you deserve each other). But at the same time, just because I don't want them to choose doesn't mean they shouldn't. If you're going down a polyamory route, I don't know if I'd say it has to be tagged as such, I mea you don't often see love triangles tagged, and it's good to see a relationship naturally develop without knowing it's coming sometimes and so looking for the cues, but I would say to be sure that it's made obvious in text. For instance, one of my issues with love triangle to polyamory is often that it's just the MC dates both, which I guess is a valid option, but you rarely see the two rivals actually build a real friendship, let alone get to the position where I could believe they could tolerate a polyamorous relationship or even just an open relationship with the MC dating both. If the rivals hate each other/barely interact, how can I believe this is going to be a stable healthy relationship? The sign should be there to at the very least see in hindsight and go ooooh they did like each other.