As long as you play the rated BG's each week, however many it takes until you cap points for the week... you'll be on equal footing (gear wise) with the most talented arena/rated BG players.

Without the possibility of a loss of points for the rated BG's, and with the increased likelihood of less skilled/geared opposition (compared to competitive arena), I'd think rated BG's would be the optimal playground for the majority of boxers.

If you've got an optimal arena composition and are skilled in that regard, that's a decent option too.