slow slow is definitely more dominant now. the argument over "more rage and more flurry charges" with a slow/fast are moot now that you swing with both weapons with whirlwind. This will yield a 50% increase on your whirlwind overall dps, which will overtake any argument of nonflurry charged offhand hits. Slow/Slow all the way now, it was decent before, and just clearly outdoes slow/fast now. Rage management will be more important now however but as a warrior who's ever tanked before, this shouldn't come as a surprise.