I've been growing Yolo Wonder almost every year and weel-satisfied with both productivity and taste.
My friend who is keeping breeding programme for peppers/tomatoes/physalis varieties at our Belarusian Institute of Vegetable Gardening developed 2 blocky bell peppers (Cubik red and Cubik yellow) similar to California Wonder but with better productivity and earliness (ripe 2 weeks earlier than CW). These are two most popular sweet bell pepper among our gardeners.
But as I already told here the main problem for sweet bell peppers is their total productivity. You can grow a healthy bushy plant but only with 2-3 fruits = less that 1 kg in total. So generally it's much more profitable to grow non-bell peppers with different shapes with more than 10-15 fruits can be riped from one plant.
I'm gonna try Neapolitan this year. It bears so many fruits on such pictures like:
And of course I will try many other varieties I've got from many of you this winter.
Wonder if there is heart-shaped sweet bell peppers?! Something like a huge pipiento...