When should we think about using an API Gateway instead of a Service Mesh?

hey everyone, i've been seeing a lot of talk about API Gateways and Service Meshes lately. they both seem to offer ways to manage and secure microservices, but they feel like they address slightly different problems. im curious to hear from those who have experience with both. when do you find yourself reaching for an API Gateway, and when does a Service Mesh make more sense? what are the key decision factors you consider? looking forward to the discussion!