You can order groceries from your phone in a parking lot between two pickups, which is exactly why it is worth slowing down once before you pick a service for your mother's kitchen. Every app looks the same on the first screen. The differences live in the delivery window, the swap rules, and what happens when the bag shows up without the one thing you needed.
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Start with the window, not the app
For you, the delivery window is the whole product. Your mother may be home all afternoon, or only at certain hours. Check how wide the window is, when the order cutoff falls, and whether the window can move if the driver runs late. A window that opens while you are sitting in the carpool line is useless, no matter how nice the app looks.
Ask two questions before you place a test order: Can I change the order after I place it, and until what time? Does the service text me when the driver is close?
Read the swap rules
Every service substitutes when something is out of stock. Some ask first, some swap by default, and some refund without asking. Look for the setting that lets you say no to a swap. Then use the order notes to say what you mean, such as "no substitutes on dairy, call me about anything else." The notes box is where you will be grateful later, usually at the exact moment you are trying to remember what your mother actually eats.
Check the door and the cold items
Who answers the door? Does the driver need a code, a key, or a phone call first? Can the bags be left inside, or only on the step? If the order includes cold items, ask how long the bags can sit before someone puts them in a fridge. If your mother cannot get to the door safely, that is a plan to make before the first order, not after the first missed delivery.
Compare the missing-item answer
Every service runs out of something eventually. Ask what they do: a refund, a credit, or a redelivery. Get the answer in writing, then ask whether a person answers the phone or whether the problem goes into a chat. On the day something is missing, you will want a human.
When you have two services on the table, put them side by side on four lines: the window, the swap default, the door plan, and the missing-item answer. Pick the one whose answers you can live with on an ordinary Tuesday, not the one with the prettiest app.
If you are also working out how the rest of the week's calendar fits around your mother's errands, The Kids' Week and Mom's Week lays out how the split works.