I ' m also a Tracer main , have had this same problem before with the indecisiveness of what to play on defense and here ' s now how I decide . 1 . If I attack first and seem to excel with my Tracer on offense . All golds and few deaths , I ' ll actually carry over my Tracer to defense , only because I have a strong feeling I won ' t be shut down . 2 . If we defend first , I try to wait to see what the team would like me to play . Reaper and Mcree are solid choices to use on defense but I also do well with Zarya or Roadhog . 3 . Don ' t look at it like you ' re stuck on Rein if you use him on defense . You ' re being very beneficial to the team and if you need to play him on offense , don ' t feel bad doing so . Hope this helped , good luck