PVP gear buyable from emblems does not shift when arena seasons change, triumph emblems buy S6/furious today and will also buy it in S8. Emblems of frost will buy S7/relentless and S8/wrathful gear will be from arena points only

If your team can farm heroics, its (in my experience) way, way faster to buy it with emblems vs farming honor. Save the honor for accessories, also the fact that your getting the S6 set vs S5 now is win