Tbh I was always a Harringrove person and then when Steddie came around I was like meh bc I prefer Steve with Billy but then I started thinking about a Billy as an ex type of thing
There's room for both in the world to me for sure, and I can vibe with Billy as the hottie ex for sure.
I find Steddie a little less interesting just to me, I've read some that I liked and some I disliked but they're kind of meh to me. They are a lot lower stakes in general, and in the way I think of them they have a lot of external conflict but not a lot of internal conflict. The reason why I don't ship them is partially just that structural reason, which sounds kind of boring and dry but it's true.
Harringrove has a balance of internal and external conflict that's just a lot more interesting to me. They're still the number one for giving me brainworms, and I can't seem to shake them lol.
And honestly, at the end of the day... por que no las dos? Actually, throw Jason in there too, they need a screamer /hj.