This is a great idea Smokin
It goes without saying that taste is a personal thing. I'm with Mango, I look for fragrance and taste on the palate, not necessarily burn. I look for a balance of complimentary flavors, i.e. apple juice and/or apple cider vinegar on pork, its like that is the way it is meant to be.
Personally, I prefer Hungarian paprika rather than the plain paprika because it has flavor. I am likely to use Hungarian paprika and cut back on cayenne pepper.
Also, I love rosemary on beef both for the aromatics and the flavor. Garlic is a must and I usually use powdered garlic. Depending on quantity, garlic can enhance the natural flavor of something without influencing it with a garlicky taste, but then on beef I like a garlicky taste.
Black pepper - fresh ground is a given. My table is always set with a pepper grinder and a salt grinder (sea salt). Although for cooking I use kosher salt.
Why so little cumin - IMO a little cumin goes a long way.
A lot of the ingredients listed in the above posts are contained in commercially prepared chili powder, so if you have a chili powder you like, use it.
I can go on with this, like brown sugar, if you want some sweetness and/or a bark from your rub then brown sugar is the way to go.
I'll give some else a shot at this while I consider some other ideas.