I don't think the choice of language/framework matters too much in the grand scheme of things provided you understand the concepts behind the decisions that languages/frameworks make for you. So pick whichever piques your interest.

As far as job prospects, my bet is on Rust/Actix. I'm pitching the idea of creating new micro-services with Actix to my company. (We're a Java shop). I implemented a simple proof-of-concept api server that takes in a single type of request, runs some business logic, makes a db call and returns a response with additional fields. Preliminary testing has shown that the Rust/Actix implementation is 5x faster at processing requests compared to the Java/Spring implementation.