Hmmm I've heard good reviews about 65 and 70 , I've also order adi power pro and power tour strings from mbs I believe, going to string all three 67 and the Adidas into three racquets and I'll see how that goes :0
Hopefully your rackets are similar so that you can make a better comparison of the strings.
I liked the ZM67 reds but I noticed the strings are don't tend to stay straightened. That is, it doesn't 'notch' into itself like Yonex strings do; like BG80, BG65 or BG66UM (the ones I've tried). Of course there's less movement the tighter your strings are so it might not be a problem if you already use high tensions, but do NOT increase your tension just to prevent the string movement.
For me the strings sound higher pitched, which results in more deception since you won't realize a smash was just delivered. If you've played with BG80, it's a deep and noticeable booming sound.
Also, ZM67 was quite cushiony feeling, unlike BG80 which feels more like plywood.
Of the Zymax range I would rather try the ZM62 and ZM65 than the ZM67 and ZM70. The thinner strings provide a lot better repulsion, though ZM62 is quite fragile.
I'm most likely getting myself a reel of white ZM65s, simply because more people would be willing to try white than red or yellow in my club (I string as well).
I'm 14 and I usually use 23lbs to 25 I'm stringing my racquets at 25 lbs, yes I do have two nanospeed 100s due too dad not realizing and not looking LOL, thank you guys I might just all the zymax strings later on
With plastic birds/nylons, thicker strings will probably be better. The power you get at lower tensions is awesome. For feather shuttles, thinner strings @ higher tensions tends to be better for power.
This is just from my personal experience:
Plastics: BG80 @ 23-24 lbs.
Feather: BG66UM @ 27 lbs.