It's all in the look that you are going for and your height. How tall are you? I'm 5'11" and my monkey bars are perfect. Look around here. Go to local bike nights. Do be afraid to ask if you can "try the bars on". And welcome
I have the Yaffe Monkey Bars in 12" and love them! Not easy to put on but the look is stellar to say the least in my opinion. The 10" would be in the way of the mirrors the 12"s are perfect, hands just above fairing. If you go apes you may as well go bigger. Just remember every manufacturer is different as far as height. My buddy has the LA Chopper apes and they are 14"s and are comparable to the 10" Yaffe bars. Measurements are different depending on how the manufact. measures them and bends and such.
thanks for the info... I am 6 ft tall and have sat on some bike that have had both 13" and 14"s on them and they have felt great. I saw the LA Choppers and Paul Yaffe's and was wondering what other have and what they thought of thiers.