Here's why Taiga is better than Jira:
Taiga is open source
Taiga is open source while Jira is proprietary software. Taiga allows you to do more things with it's code and it allows anyone to view the source code
Taiga allows guest access for free
About a month and a half ago, I pointed out that there is a lack of transparency between the developers on TotalFreedom. Taiga allows you to create public projects for free which allows us to see what developers are doing and it fixes the transparency problem we have. Jira forces you to pay a fee to allow guest access to see your projects.
Taiga is more secure
Taiga is more secure than Jira because it's open-source. Anyone can audit the code of Taiga and check to see if there's a security issue and report it if there is one. For Jira, you cannot see it's source code. The only way to know if there is one is that we're the first to be attacked, or if we're notified by Jira themselves.
Taiga is highly customizable
The On Premise version of Taiga gives users 100% control over the software, which means you can basically do anything you want with Taiga. Jira is a cloud based solution, which means they have control and they can suspend your project at any time.
Taiga has a built-in importer
Taiga has a built-in importer, so you can transfer everything from Jira to Taiga.
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