Great with both 3.5mm jack and uSD-card slot, but I hope future models will have a removable battery like phones used to have, just pop off the back and switch to a new fully charged battery.
I also wonder what happened to the FM-radio feature that phones with 3.5mm jacks used to have, it's great to save battery and when you are out of data/out of range, also great in emergency situations where you need to be able to listen to the radio for important information.
This morning I got a emergency message from the local government that said I had to listen to the local radio station for more information about the emergency. I have an old phone with 3.5mm jack and radio, so I just had to plug in headphones and open the radio app to listen to the emergency FM broadcast.
Phone manufacturers should bring back useful features like easily removable/replaceable batteries and FM radio.