I had two on my iPhone for my last trip in June, WDW lines and Magic Guide. They are somewhat different and I was glad to have both. WDW Lines if you sign up for the subscription includes touring plans. We used them as guides but did not follow the plans exactly. It also includes a 10 day attendance forecast for each park which we used to plan our park schedule. We used the wait times sometimes.
We used Magic Guide more than Lines when in the park, the interface is friendlier. We liked the map to see what was close and sometimes to map where to go next. It was particularly helpful to determine what food was close. You can also enter your ADRs in Magic Guide and identify favorites.
We used WDW Lines for entertainment schedules, for example the times the pianist performs at Casey's Corner.
I have loaded the new Disney app, and will test it out in October.