Nice thread.
I love them all and very rarely there's a romcom I don't enjoy
My favourites would be (in no particular order):
The Quintessential Quintuplets
Kaguya-sama Love is War
Toradora
Date a Live (although this one focus on other stuff too)
Nisekoi
I also really like Rent-a-Girlfirend but only because of Mizuhara and nothing else
Special mention to Yamada-kun and the Seven Witches and Zero no Tsukaima and My Dress-up Darling.
Even the others I like them a lot like Oreshura or We Never Learn or
Invaders Of The Rokujouma.
I'm taking a look at Oregairu. Let's see how it goes.
Hot trash: Heaven's Lost Property.