Best UA Apps for Apple Watch

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Hey everyone, I am new to using all the features here and not sure if this is the right place to post. I started using myfitnesspal and mapmyrun together with my Apple watch and have a MVP account with mapmyrun. I also see there is another UA fitness app Endomondo. Does anyone have any information on this app? How does it differ from mapmyrun, is it linked to the same account like mapmyfitness? Is one better than the other for use with my watch? Thanks in advance!