ANSWER:

Both are authentic, you switch between both to gain the maximum reward. 

Which among the two dhirk is More rewardable for me to be reciting more, because I saw a Hadith the prophet said saying lailahaillallah wahdahu lasharikalahu lahul mulku wa lahul hamdu wahuwa ala kulli shayin qadir is the best dhirk that he and the prophets before him said, also reciting it 100 times a day nobody does anything better except he who says more. AND saying subhanallah walhamdulillah walailahaillallah wallahuAkbar is better than anything the sun shines over.