Sugar is a Stockfish derivative which had been subject to cloning discussions in chess forums since its first release.
After the author released its source code, the opposing community seemed somehow calmed down and further releases came in parallel to Stockfish development.
My personal opinion here is that such parallel developments so close to the original, be it legal or not, lack the taste of alternative colors.
Some state Sugar is even stronger than Stockfish but i don't take this to serious unless Sugar finds its own way to overtake the fish considerably. I don't think it's possible to overcome an engine progressing with the help of thousand of cores testing countless patches continously over a wide network.
Anyway it's everyone's free choice to try and use Sugar on Android. You can just get it: HERE