No questions asked, PARTIKO! Ever since I've discovered that very smooth and slick of a mobile Steem app, my engagement in Steem improved a lot.
Before I met Partiko, I used Google Chrome's Incognito (mobile) to browse Steem and since it doesn't allow one to store passwords, I have to log.in back and forth whenever I get notifications from GINA.
Partiko solved this problem for me as they have their own notification system (although it lacks whenever you are mentioned atm). It is also surprisingly fast and smooth with a very simplistic minimalistic design. I have used other Steem mobile apps before but ended up uninstalling it after 3 days as it lags a lot or loads very slowly.