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Marinades: from scratch
Rubs: start with an Aldi pre-mix as a base and tweak as required
Sauces: bottledReasons, marinades I use a lot so it makes sense to mix my own. Generally Dark Soy, brown sugar, honey, ginger, garlic and oil. I don't want chillies and too many pre made stuff has an unnecessary kick.
Rubs, I can't be arsed with all the hassle so pick a rub that's close to what I need and just add in extra paprika or five spice to get what I want.
Sauces, I don't use enough to warrant making my own and there are so many on the shelf that I don't see a need to mix my own. Aldi do a good bourbon BBQ sauce, when I heat through a bag of pulled pork that I've frozen off I add the Aldi sauce and it works a treat with the smoky meat.
It always surprises me how often you yanks use proprietary sauces or spice blends for bbq. Very few British cooks will ever admit to not making things from scratch. Though to be fair most of my bbq sauces are based on tomato ketchup.