I don't think there is a deal breaker, its a matter of personal opinion. I had both for ages, then in a fit of budget induced cost cutting one had to go. It was a difficult choice. Both companies produce exceptional products, both companies provide great service, both companies regularly post on this forum and I hope both companies prosper.
Which one did I choose? Personally, I use neither in flight but prefer the stone age reliability and compact size of my Garmin 495. The ipad stays in the flight bag and I look out the window. The Garmin tells me all I need to know.