Choose Fly.io if you're a solo developer looking to deploy latency-sensitive applications close to your users. Its low-latency, multi-region capabilities and scale-to-zero machines are excellent for applications where performance is crucial, even if it means managing a bit more complexity. However, avoid Fly.io if you prefer a predictable monthly billing model or want a hassle-free, zero-operations deployment method.
On the other hand, select Linear if you're part of a software team or a startup that values speed and design in project management and issue tracking. Its streamlined, opinionated workflow is perfect for keeping teams aligned and productive, although it may not be suitable if you require extensive customization or have a large team that would incur high per-user costs.