Better Than Bullion is some high quality stuff, but any bullion is great to have on hand. It’s hard to beat a fresh stock if time and resources permit, but I’ve just about entirely switched to using bullion derivatives instead of stock cans or cartons for lower effort meals. The stuff keeps for ages and is practically impossible to waste. Sometimes I used to have incomplete stock cartons and wouldn’t use them in time. That’s a non-issue when I’m making stock as I go with something like BTB or Knorr.
A couple of my local groceries sell packed chicken feet, and I absolutely love them for stocks. They’re packed with gelatin and I end up with silky stocks that look like Jello in the fridge. Store rotisserie chickens are also great for stocks in my experience. I get a meal or few out of most of the meat, then you chuck the rest in a pot to turn into stock.
I think at least one of my local groceries also used to sell ox tail. Great for beef stock, but I think it got expensive after it became a trendy cut for some reason. I don’t remember how that happened, I guess people got in the know 🤔.