Just search "Jira vs Flow" or "Jira vs Asana" or "Flow vs Asana" and you will find a bunch of sites showing competitive breakdowns.

Flow looks way more tailored towards simple SMBs that you would think would have trouble dealing with something like Jira.

But Jira starts with a Free tier for < 10 users and the next level up is $7/month/user.

Flow starts at $53/month for 6 users. With far fewer features. The next tier is just "only by quote".

Flow is the least featured but it's starting price point seems to be the most expensive.