Board Thread:Questions and Answers/@comment-32080422-20170712172435/@comment-33728484-20170712174351

The bottom right path gives you 4 star nodes, and you can increase his critical attack chance by A LOT. You can also raise his additional attack.

Top left is the second best choice, it gives you 3 star nodes where you can, again, increase additional and critical attack.

Top right gives you only 1 star node, and you can choose between ATK boost and Super Attack Boost. Not that great.

So... if you want him to hit hard, choose the bottom right path and raise his critical attack to lv.9, that will make a huge difference, a lot more than +5 SA boost could ever do.