If a carbon tax is inevitable (not convinced yet), the only credible plan I have seen is Michael Chong's federal revenue neutral tax.  The major differences are the significant income and business tax cuts in advance of a gradually rising carbon tax, and corresponding cuts to other expensive federal green programs to help to pay for it.  I.e. it is a truly market-driven approach.  

Another reasonable approach is Erin O'Toole's proposed industrial incentive program for reducing emissions.

Trudeau's approach (like Wynne or Notley) is excessively expensive, as it layers on another tax on top of already high income taxes, and actually augments government overhead (both the existing green funding programs and net new overhead to sort out McKenna's unnecessarily complex carbon plan).  

Sadly, Chong is a long shot in the May 27 leadership race, and if a far right candidate like Bernier is their new leader, we may well be at the mercy of Trudeau's tax and spend ways for another 6 years.