For me (62 and crappy eyesight), at 200 yds, a 3x9 is not enough power to get decent groups, while 4x12 works pretty good for me. If you are young and have good eyesight, a 3x9 might/will work at 200 yds. I have 6x25's on my FV12's, but I intend to use them for prairie dogs out west. I have an mid 90's 6x20 on another 223, again for p dogs out west.
If you want to improve your shooting skills and groups, then get a bit more power than you think you need, you can always dial it back on the power setting.
If you want to improve your shooting skills and groups, then get a bit more power than you think you need, you can always dial it back on the power setting.