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If you mean non-rechargeables, all batteries of the same technology are really the same in capacity. Doesn’t matter if you buy an expensive brand or the cheapest bulk store brand, the difference is a couple percent and depends more on the age of the cell and how it was handled.
Just get cheapest store-brand alkaline if you must, but really best avoid altogether and use rechargeable.
Alkaline batteries range from 3-5 Wh (https://docs.google.com/spreadsheets/d/16UTSIimjNXl9OP0cFWmLtISe7LHXUng_S6tyzWrjCuU/edit#gid=2136035052), Zinc batteries are around 0,6Wh