My 1st synchro monster in duel links. Easy to get and powerful. It is among the most used monsters because it is f2p. The other lvl 9 general synchro worth using is vermilion, wich is Ultra rare main box card, aka difficult too get for f2p.
Quarion and Field Marshal are worth using but that need for 3 monsters on the field is so terrible. I very rarely run synchros that require 3 monsters on the field instead of the reasonable typical 1 tuner + 1 non tuner.