I would go with classic way: 2h forcewave.
The reason is that retaliations are most gear demanding builds that works great basically only after you reached end-game and invested into them a lot. However it should be possible to level with physical retaliation itself - with full Perdition set (since level 40) + Ugdenbog Girdle (since level 40, highest acid->phys conversion recommended). I read some players opinions that it’s comfortable but I don’t know any guide with step-by-step to do that.
So:
- If you are beginner go with guide linked above.
- If you are more experienced and got some gear already then you can always make an attempt to level with retaliation and eventually switch into forcewave if it fails.