I think ultimately the deal breakers that made me go Garmin was I didn't want the phone I use all day for dozens of things, get damaged on a bike. I would have wanted to put an Otterbox or Lifeproof heavy duty case on the phone while riding , yet hate these cases for everyday use, so would have needed to install into the case, then remove, which is a PITA. As well the Garmin touch screens work while wearing gloves which is VERY useful, if like touch screens.

Never found a good solution yet agree with John V about why use 2 devices. The only argument to that is you would carry a phone even if using a basic Cateye, so no real difference except you have less to deal with getting the phone and battery tweaked to last a day.