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I have the Flow in both Opto and GL plastic. As you know molds can vary, but I find my GL Flow is less stable and has more glide than my Opto Flows. Now I don't throw that far, but when I compared the Flow agains the Wraith. I found them to be neck and neck in distance, but the Wraith was more stable. With the Flow I could get a nice straight flight or a little helix when thrown right. However, I was more consistant with the Flow and it seemed easier to throw and achieve the same distance. As far as the rim, they seemed to be about the same size, but I really didn't take note of it. I'll just add, the Flow is in my bag and the Wraith is no longer in it. Oh, just to give you a reference point. I throw around 300 to 330' and the Flow is 170g.
Even if these two discs are tied in performace. The tie breaker is the plastic. IMO GL plastic is the best current plastic made today. I have a GL Vision that I've been throwing since the plastic first came out. Aside from the common scuffs. The disc is still in great shape.No nicks or gouges at all and I've hit my fair share of trees and rocks. The Opto is just a duarable and more tacky, but not as long as the GL plastic