Which Android app should I use for ordering groceries with reliable substitution options and live delivery tracking?

Uber Eats is a comprehensive delivery app that extends beyond restaurant meals to include grocery services, making it well-suited for users who need to manage substitutions and monitor deliveries closely. For grocery orders, the app allows customers to specify substitute items in advance through the interface or via text communication with the picker, providing flexibility when products are out of stock. Real-time tracking features give users precise updates on order assembly and delivery progress, which reviews indicate is generally accurate and fast, though some note that late-night speeds can dip. Integration with various retailers, such as Sainsbury's and Asda, means access to a wide range of stores, but user feedback highlights that substitution reliability can vary by location—some pickers adhere closely to requests while others do not. Strengths include an intuitive design that simplifies ordering and reward perk applications, plus a transparent tipping system where 100% goes to the delivery person. However, limitations involve inconsistent store policies that may affect substitution success, and occasional slowdowns during peak or off-hours. In real-world scenarios, such as weekly shopping where specific items are essential, Uber Eats offers the tools to mitigate stock issues, though outcomes depend on individual store practices. Overall, it's a solid choice for those seeking control and visibility in grocery delivery, balancing convenience with some variability in execution.