Linear and Jira both track software work, and they disagree about almost everything else. Jira gives you a system you configure to match your process. Linear gives you a process and asks you to adopt it.
Which one fits depends on your team's size, how much process you have to model, and how much setup you are willing to own. Here is the comparison.

Linear is an issue tracker for software teams. It is built around keyboard shortcuts and a UI that responds instantly, so filing and triaging issues costs seconds rather than a page load each.
The design decisions that make it fast are the same ones that limit it. There are fewer knobs to turn than in Jira, and the workflow mostly works the way Linear thinks it should.
That suits startups and it suits product and engineering groups inside bigger companies. It fits less well when other departments need to live in the same tool.
Speed: Most actions have a keyboard shortcut and the UI updates before the server confirms. A new team is filing issues the day they sign up.

Jira is Atlassian's issue tracker, and the default at most large software companies. It covers issue tracking, project management, and the ceremonies that come with Scrum and Kanban.
Big organizations pick it because it bends to their process rather than the other way round. Custom fields, custom workflows, permission schemes per project, reporting on all of it, and a marketplace of apps for whatever is left.
All that configuration has to be built and then maintained. Larger companies staff someone to do that. A team of eight ends up with a tool that takes a week to set up and still does not match how they work.
Templates: Start a project from a preset instead of building the workflow yourself, which is how non-engineering teams get set up without an admin.
We run on Linear, so treat this as a biased answer with reasons attached. For a product team under a few hundred people, the speed and the flat pricing win, and the configuration you give up is configuration you would have spent a week building.
The customer side matters too. With Productlane, the feedback that justified a feature stays attached to the Linear issue that ships it, and the customers who asked get told when it lands.
Jira is the better answer when the process is genuinely complicated: several departments in one tool, audit requirements, or reporting someone outside engineering depends on. That is a real category, and Linear does not serve it.
Yes, Microsoft offers Azure DevOps, a suite of development tools that includes features similar to Jira for issue tracking, project management, and CI/CD pipelines.
Jira has been the default for two decades, so most engineers have used it somewhere and most companies already pay Atlassian. The customization and the app marketplace keep it there once the process is built.
