Personally, I would not stop at just one specific method.
There is a series of criteria that could be ranked by importance. For example, one of the criteria could be the regional representation of a party. If a party has no representation, it would be a priority to give it an MP.
The parties can also make choices. In any given party, there are candidates who make a very good showing but usually do not win. That is another avenue to consider.
There are other criteria. I covered them in my full brief. I also studied the Quebec elections. There is a hierarchy of three or four criteria that could be used as a way to designate additional MPs that would not be arbitrary, that would not depend solely on the party, as do votes based on proportional lists, and so on. The party often calls the shots in this regard.