Lots of things but android is full of bloatware (especially samsung products), its like they hate android so have to recreate all the apps again which you can't un- install.
Very poor firmware updates to new os (again very poor with samsung). Fragmented by region or carrier. I never did get an update for a samsung tablet last year after update had been put out in some countries but not others. With apple it happens world wide on same day.
The display is nice but thats as far as it goes. The 6 is a very capable device.