asking a question like "which tank class is best" or anything under the same category is honestly too broad to answer under any circumstance. different classes have different utilities so even, if in any case, one is better currently; any additions to the game could change the viability of that certain class' utility because of mechanics... its like asking someone to tell you which drug you should take to cure you of all your 50 illnesses while one might work for a few another is going to take care of others and others of others and so forth... it completely boils down to what you are comfortable playing because in all cases skill>class