What’s everyone’s favorite rub to put on ribs that you can get from Wally World or Kroger? I like sweet with some heat if that helps
This is a horrible answer to your question because I don't buy any pre-made "rubs" or meat seasonings, but if I had a gun put to my head I think I would walk in and buy this:
In TX it seems that adding sugar to rubs or meat seasonings is not a common thing. I've never seen anyone around here do it unless they were going after some kind of Asian flavor that has sweetness (Bulgogi, Char Sui, etc.).
Sugar seems to burn way too/more easily and get bitter where other seasonings don't seem to have the same issue. That coupled with the point where regionally I've never seen sugar used in rubs,... I simply add all the sweet I'm looking for at the end with a sauce. I usually add bbq sauce that has some sweetness to it when it's on the plate rather than while still cooking. This way everyone gets the ribs the way they like it (sauce/no sauce, sweet/no sweet, dry/wet, etc.).
My usual rib seasoning is just black Pepper, Onion (deydrated/minced/granulated), Garlic (granulated), Paprika, in even parts and then Salt in like 1/2 or less a part.
Ribs are probably the easiest meat to over salt that you will smoke!!!!
It is nice to be able to control the salt by adding it separately.
Finally, I personally like a bit of heat on my ribs like you do and I will add a little Cayenne (almost equal to the amount of salt, maybe less). Cayenne will give great flavor even before it imparts heat so it is a good spice you can sprinkle a good pinch of on to any smoked or grilled meat to get the flavor and you can fine tune the amount to add basically no heat/all flavor or as much heat as you want.
When I'm making ribs for myself I have this wonderful Kashmiri Red Pepper powder which is like a combo of Paprika and Cayenne when it come to flavor and heat. I replace the Paprika and Cayenne with the Kashmiri and I'm in rib heaven!
If you get interested in getting more bang for your buck and making simple yet amazing rib rubs and seasonings really look into just buying Salt, Pepper, Onion, Garlic, Paprika, and Cayenne and shaking them on yourself. You will be amazed at the flavor they provide even when buying the $0.50 - $1 spices (5th Season) at Walmart and giving it a go. I buy those when I go on trips or when someone who doesn't cook wants to "cook/grill" for an event and I know they don't have crap for seasonings hahaha. They are a nice gift to leave behind for them to learn a play around and cost very little in the way of spices.
I hop all this info and rambling helps! :)