Define best. :-)
I prefer ISS Detector Pro because I can use the filter to select only the sats I am interested in seeing passes for. Then on the main screen it shows me each pass for the sats I've selected. Heavens Above you have to see ALL "radio satellites" or search for an individual sat. All radio sats as they call it include a lot of sats that I have never even heard of and I assume are no longer functional.
Here is a table of a bunch of apps and some reviews:
http://sats.wikidot.com/what-apps-can-i-use-to-track-satellites
73, John Brier KG4AKV
On Tue, Apr 23, 2019 at 3:36 PM 73 Bob W7LRD via AMSAT-BB < amsat-bb@amsat.org> wrote:
The "best" sat tracker for android phone is----
73 Bob W7LRD _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb