Mho
Well, I have shot both. Shot in MBR for 3 years, moved to MBO for 3 years, shot HC for 2, and now I am back in MBR. Here is what I have found as pros and cons for both.
Scope pros. You can see target and rings better. You can dial the yardadge you want. You can shot any equipment you want.
Scope cons. Rain can flush you day and scores down the tubes. It magnifies your shakes. The sun/shade can really cause problems. Groups at the stake seem to take longer to shoot.
Pin pros. No lens to catch rain drops. Sometimes seeing your pins on the target can let you know your first yardadge number might be a bit off.
Pin cons. My biggest trouble is having to "shoot the gap". Holding the spot between the pins is tough for me to do sometimes. Not being able to find that spot to shoot at that you found in the binos.
All in all I liked shooting MBO. Dialing up the yardage, and bringing that target in closer in the scope was nice, but for me the worry over weather and back-ups was to much. The best thing I can tell you is to try it for a year and if you don't like it, we in the pin shooting-brotherhood will always take you back. :wink: