Jira is in many ways the "hub" of the Atlassian eco system and I'm hard pressed to find an alternative that will integrate with so many other products. If it's just Bitbucket you dislike, then you could just sign up for Github. The rest of the Atlassian suite isn't that tied to Bitbucket.

I worked for a company that used Confluence and Jira with Github and I now work for a company that have a self hosted Bitbucket, the integrations are equally good (in my opinion).

It isn't until you try to replace Jira you'll run into problems.