why aren't fallen angels as popular as vampires?

I was wondering why aren't fallen angels as popular as vampires, mostly in fantasy books and fiction in general, I rarely encounter world-building that touch falling angels, but can find so many that revolved around ancient vampires. Besides a romance novel that did no justice in my eyes to the trope of falling angels, ( fallen becca fitzpatrick to anyone wondering), I couldn’t find any others, and yes, I have read the city of bones trilogy and it either does no justice to the trope — which leads to a second question, why when it IS written, it is executed poorly or too niche-romantic teenage novela? Thanks for anyone answering ahead!

I was wondering why aren't fallen angels as popular as vampires, mostly in fantasy books and fiction in general, I rarely encounter world-building that touch falling angels, but can find so many that revolved around ancient vampires. Besides a romance novel that did no justice in my eyes to the trope of falling angels, ( fallen becca fitzpatrick to anyone wondering), I couldn’t find any others, and yes, I have read the city of bones trilogy and it either does no justice to the trope — which leads to a second question, why when it IS written, it is executed poorly or too niche-romantic teenage novela? Thanks for anyone answering ahead!