Complimenting is about versatility and survival normally. As a giant, i get shieldless charge, which is a big deal to me. A fairly effective setup, until you hit something with heavy stander, would be having smash, critical hit, *weapon mastery, combat mastery, assault slash, lightning or icebolt, and probably thunder, at least partially, all ranked. Magic mastery and lightning mastery may go with it to support that. This will enable a basic, but powerful, combo of smash, delayed assault slash, smash, counter, ice/lightning bolt, counter, assault slash, then repeat from the second smash part.
Ranking lightning bolt a few times will increase the cast speed, assault slash increases the distance. The passives are a bit obvious. Thunder will be good for rafting, should you ever do it, as well as offering a wonderful support for both your party, and lack of a powerful aoe and/or an actual good ranged attack in that build. You may substitute thunder for a ranged attack if you want, just make sure to build on your actual dex if you do, and be prepared for misses.
It primarily boils down to how you want to play, what kind of things you intend to do, and how early you want to try to push into harder content. Bear in mind, a lot of g9+ story content, is based on your total level in terms of difficulty, and you only get free skill resets up to 100. That is important for easily training windmill and refine. So balance your training with your progress if you don't want a rather difficult story.
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