I steadfastly believe that Kroger is handsdown the best. There are usually 8 to 10 items for under a buck or moneymakers each week. And they are things I regularly use or will eat, etc. When you stack with their 'Buy 5 Items, Save $5' (B5S5) promotions, Kroger Cash Back (KCB), PQ/DQ, and other rebate sites, it is awesome.
WM is just too hit and miss for me. In Indiana, I don't get the vast majority of great deals Felsky and others post. She is the primary reason I don't think WM is pointless with ibotta. Until she started posting her WM hauls, I just had no faith in them.
Maybe I am a homer, But sometimes I feel like a Marge.
The bar code associated with the TC# at the bottom of the WM receipt.
There are a great deal of us who don't link WM account.
Unlinked all you have to do is scan the receipt bar code.. You dont have to scan product UPCs.
And similar to what @mmoore01 mentioned, I scan the code to submit my receipt, and I verify it is added to my account before I leave the store. Usually it is done in under a minute. YMMV.