I can see on the Beyond Compare option list for the mergetool that one can specify to favor the right or the left side with -favorright
or -favorleft
option.
If I try to use it I get an error
$git merge master
[...](Actual merge with some conflicts)
$git mergetool -favorright
usage: git mergetool [--tool=tool] [--tool-help] [-y|--no-prompt|--prompt] [-O<orderfile>] [file to merge] ...