- Local garlic is well-suited to your growing region- Because you are purchasing garlic that is grown close to where you live, it's unlikely that you could pick a varitiety that won't perform well in your garden (at least not because of normal climate issues)
- Greater variety of garlic is available to you- My go-to Garlic family grows 40 + varieties of garlic each year. That's a LOT! Most seed companies I looked at offer 3-10 varieties.
I've grown garlic at home for several years now, and each year, although I'm able to save a heads to plant, I make a point to buy some from local growers too. That way, I can try new garlic types, and do my part to make sure that garlic lovers in my city & county get to by from those local growers for as long as they'd like to sell! Planting occurs around (Hardiness zone 6a) at the end of October-beginning of Novemeber, but it's not too early to start stocking up now! Good luck selecting :)