Many of us won't know, because for low & slow cooks we used extruded coconut lump charcoal. It's poor-mans Japanese binchotan charcoal, if you know what that is. Komodo Kamado makes the best extruded lump, but I also enjoy Than Charcoal as an alternative, a bit less neutral in a way that reminds me of roadside Thai barbecue.
Komodo Kamado's coffee charcoal, when available, is the single best lump charcoal I've ever used. If you're cooking for restaurant investors, pull that out.
There are many ways to look at ordering KK charcoal. People go for pallet shares (group orders) which is a great way to meet people in the clan, but there's no actual definition of a "full pallet". Try different orders, e.g. 12 boxes, to see how shipping works out, and just go for it. Or order a few boxes of Than and save it for low & slow, if infrequent.
It kind of depends on your price sensitivity. I've always found that a poor memory is the best way to get past spending money.
A heretical point of view would be to buy high quality briquets, with no filler that changes the lump taste. I love all Fogo lump charcoal choices, and I've recently started buying their briquets. They're denser than lump, and the uniform geometry also helps with getting to 550 F for pizza.
KK COCONUT SHELL AND COFFEE WOOD CHARCOAL
Than Charcoal, Chef's Choice Premium Grilling Charcoal, Log Style, 22lb
Binchotan White Charcoal
FOGO BRIQUETS (2 BAGS OF 15.4LBS)