Does being in sinus rhythm before ablation lead to better outcome?

My ablation is coming up soon (just got rescheduled because of a cancellation). My paroxysmal A fib is under control at the moment, having this year changed meds three times and converted in the ER once. (I'm now on amiodarone.) Is there any indication, anecdotes or research about ablation success when you're in sinus rhythm before the procedure? Is this an advantage? And does your physical health and fitness help determine the outcome at all?