LOWEST
Not the most profitable. I'd say use these when you're getting the hang of ABing. Don't restock very often. Not much competition.
Book shop
Food shop
Bakery
Petpet Supplies
Pharmacy
Tropical Food Shop
Chocolate
AVERAGE
These shops restock more often than the low risk shops but less often than the higher risk shops. There is a tad of competition, not much honestly.
Spooky Foods
Pharmacy
Gardening
Pizzaroo
Grooming Parlour
Unis Clothing
Collectable Card Shop
Fresh Smoothies
Gift Shop
HIGH
These shops have many restockers and autobuyers. They are more difficult to restock at since they only restock a few times per hour, but they have many valuable items. You get good profit from these shops.
Plushie Shop
Toy Shop
Furniture
Post Office
Collectable Sea Shells
Petpet Shop
Robopet Shop
Faerieland Petpets
Wintery Petpets
Kayla's Potions
Legendary Petpets
EXTREMELY HIGH
The profit gained from these shops is huge if you know what you're doing. Most things that restock in these shops are UBs. They restock about 1-2 items per round. Many people decide to just amp up their ABer settings, dont do that, you'll be ICED. Keep your delay above 1200 and your buy time above 2000.