Difference between ROC, ROIC and return on margin

And is Return on Margin useful, really, especially if using portfolio margin?

 

ROE is obviously a much better metric and much more justifiable.

 

ROE commingles leverage, actual return, and turnover.

return on margin is meaningless as margin keep changing.

I use:
return on gross capital invested (longs plus shorts)
Return on notional for my options strategies
Annualized return on notional for my event driven stuff