i think ferment vs vinegar based plays into it as well
i do vinegar based sauces
i focus on color, so my red last year got a variety of red peppers......cranberries (wild, local), garlic, carrot (to stretch)....and that was it until blend and strain.....then it got a little pom juice and agave syrup (plus xanthan)
i want the flavor of the peppers, yes......but i also want a little depth, and find that the flavors i chose, if i keep them in the background, heighten the pepper taste? compliment it at least? and make it a little more complex....
my yellow often gets mango & papaya......if i didn't tell you, you wouldn't know.....but it brings out the fruitiness you see with many of the yellow varieties
i made a peach with pears & ginger last year that was my favorite ever......it needs a little more of each this year, but again i try to keep the peppers in the forefront
i did a chocolate sauce with 4-5 varieties of chocolate last year.....it got pumpkin & ginger......it was good, but might go a different direction just for variety
i should have enough red this year to do a smoked red, where i will smoke the peppers, add some garlic, probably some smoked onion, and cherries......if i can find a source for good cherries
it's all about what you like......i really like a fermented sauce with little added to it, but fermentation takes the sting out of things a little and does a nice job melding flavors; i haven't gone that route yet, so i get that flavor meld and mellowing a little with some added flavors