We've had pretty good luck, in terms of reliability, with all the "big boys" here in the states: DoorDash, GrubHub, UberEats and PostMates. DoorDash has been dipping in to the grocery/shopping delivery market a bit and they do a good job with that. I prefer Shipt for grocery delivery though. I love that, when you get a shopper you really like, you can add them to your "favorites" list and your favorites will be offered your jobs in the future before they're made available to the general pool of shoppers. So after using it for a couple months, we always get someone we know and trust.