Dps healers/tanks

[Bwomp]

So I have already decided to level a traditional tank and for group content. I would like to make a dps healer or tank as a goof around but still somewhat effective alt. Tht being said I would like current opinions on whic tank class can get the most dps and survivability combined and same with healer class. I dont really care wht faction but I would like to know what you think would be the best tank and healer for this fun role for each faction. Thanks!