OK, I'll list what I can remember right now and that certainly won't be everything. Besides the battery life being less on the Phonaks there are other important differences between Phonak and Oticon. Remember I'm comparing Phonak Paradise and Oticon More.

Phonak advertised that they can pair with up to 7 devices and run 2 at the same time. I have not found that to be true. For instance when the app is open or even running in the background the remote controller doesn't work. And the audio won't connected to my computer when connected to the phone. The Oticon connectivity (with iPhone) is seamless but more limited in terms of devices.

The Phonak uses the hearing aid microphones for hands free phone calls. You don't have to talk into the phone. But people on the other end of the call hear any background noise around you. Not able to shut this off. Oticon uses both hearing mics and phone mic.

The Phonak outgoing calls connect directly to the hearing aids. But incoming calls answered on the phone go to phone audio and you have to manually switch to hearing aids. Calls can be answered with audio going directly to hearing aids by the "double tap" feature (double tap a hearing aid to answer). But the double tap is more like a double THUMP. It is hard to hit that tiny hearing aid with enough force to activate the feature. Oticon connectivity is seamless.

The worst thing for me is that the app, even while running has to connect to the hearing aids each time you want to use it which takes 10 to 20 seconds. The app disengages each time the phone goes to Lock Screen. The Oticon app is more user friendly with ore usable features.

The Phonaks do not have a "mute" feature to mute the hearing aid mics. I use this feature a lot when driving alone. I mute the mics and listen to streaming music without the road noise. There are times when I enjoy more silence and less stress.

On the plus side for Phonak I can hear a little better with them. The Oticons pick up sound from all directions (hence the name More). But I'm not able to tell where the sound is coming from. The Phonaks are better at that. And the Phonak allows me to hear for the first time the oven time on our kitchen stove. No other hearing aid has done that.

I"m sure I"ll think of more differences right after I hit the "send" button

I have Oticon More rechargeable hearing aids for my severe hearing loss. I was hesitant about rechargeables because my sister had an earlier version a few years ago and by 3:00 pm they were dead and she had to recharge. Needless to say, that wouldn't be acceptable. I put my hearing aids in as early as 5:30 am and wear them as long as to 11:00 pm and have never run out of charge. I take the charger with me when we travel, of course. I have become so used to them that I've forgotten what a hassle it is to have to change batteries before I go to a meeting or concert or event, so I'm not caught having to change them in the process. I've never been in a position where I went beyond that time span, but would have to think seriously about how to address that if I'm ever in that position.