There is a third option, yes, you can write importers.
On server, it used to have a pile of off-the-shelf importers for legacy systems such as bugzilla and redmine, and it was (and still is) possible to write your own (I helped one place write one for Remedy as that needed to be taken out and put out of our misery as fast as possible)
On Cloud, you can't write those type of plugins, but you can write stuff to use its REST API to get data in from other systems. You'll need a third system to do this with though. (So you've got Jira, Omnitracker and a migration system)
The pseudocode for this would be
- Export from Omnitracker, either by some form of file export it provides, or something that can read it remotely from the outside
- Parse the export into a pile of issues, fields, attachments and everything else you want to migrate into a Jira shape
- Run a series of REST calls, pushing your data into Jira as needed
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