My personal favorite for flavor is the humble poblano with its mild heat and great flavor that virtually anyone can eat and enjoy. That is why the poblano features in so many of my hybrids. Next in line is the common jalapeno. There is a reason, in my mind at least, that those two are some of the most common peppers found.
With that being said, I also love diversity... but you asked for favorite annuum and for me it is the poblano.
I have bags of frozen stuffed red & brown poblanos in the freezer.
My question to anyone who knows.
I bought what I thought were poblanos from super seeds that would ripen Red & 3 plants did while one plants pods turned brown.
On more than one Pepper seed seller they describe their Poblanos turning red or Brown.
I thought the Mulato Isleno pepper was the brown poblano. What's up?