First of all we need to compare the stats of the unreinforced ZH armor with the honor set; the stats on ZH set can give more bonuses, not only the bonus but the stats. For the ZH chest piece starts off with 422 phy def while the level aika gold 50 honor one starts of with bout 375. Each piece of the zh set gives hp and mp and the honor set for crit, reduce damg from other nation.
For Level aika online gold 50 Honor armor is Rank D, ZH armor is Rank C. The only advantage of the level 50 honor armor is the ranking but you do not get why people say the Honor set is the strongest well that is if you get the Rank B one when the ZH set gives higher stats and bonuses.
When they say this majority of the time they do in fact mean 55 honor gear not 50. And if they still say ZH is better, they either mean cash shop it really highor their one of the many dumb WR who do not even max glory or valor. For the average player, ZH is better since it has better set bonuses.
If you're going to +7 or high it like a CS, then honor is better because that little -10 damage from players starts to add up with all the -% taken from +4 or higher. Just have fun in Aika.