[jedberg]

Serverless is a way to deploy code. It has its tradeoffs in cost and scaling and speed, just like anything else. Most of the advantages are in more rapid iteration and deployment, since you're forced to deploy small chunks of code at a time.

But if you have an API that is getting sustained traffic, Lambdas probably aren't your best bet -- you're going to want a container that is always running.

But to be honest, with 120 routes and 100 users, it sounds like Lambdas are a good way to go.