Of course ultimately, it is about preference and what you value, but just for discussion/fun's sake, let's do this.
Who is a better in this scenario, assuming they both have the same ROI, drawdown, win rate and whatever statistics (lot size) you deem to be important-Trader A: the trader that trades the same few pairs over and over or Trader B: the trader that is able to trade many different pairs?
Trader A is obviously skilled in the sense that he is able to capture the trend moves, counter-trend moves, all the small and big moves in that same few pairs. On the other hand, Trader B is able to understand and execute across different pairs.
Who, in your opinion, is the better trader, assuming you got to pick one.