I have used both and prefer OT2. I'm a Mac guy and have found the app to be very easy to use and if you have any questions, the owner Larry is quick to respond and very helpful. With his guidance, I have been able to build tapes quickly and easily. I can see the advantage of AA for viewing on a phone etc ... I just don't have a need to do so. I have records for each bow/arrow combo for all my family and target/ hunting setups ... very simple to use and experiment on ... I think both will do the job, so I beleive it's more of a UI choice ... My .02