I think a more appropriate question is "What kind of oil would best suit my bike/riding style?" Here is the gig...
Synthetic oils are remarkable at making things slickery, reducing wear, increasing engine life, reducing friction, increasing power... all of the things we want for our machines. Motorcycles, however, have wet transmissions, as in they sit in a bath of engine oil. The biggest problem with synthetic oil is that it works too well. Depending on the gross weight of your bike, and the style with which you ride, synthetic may be a huge mistake. I have encountered clutch packing problems, lots of slippage, etc... on very light bikes running full synthetic. We all want to think we are world heros when we ride... but I will break it down like this.
1. Squids: Lots of wheelies, burn outs, drag racing with other squids. (If your tires are bald in the middle and meaty on the sides you are a squid.)
***Stick to factory recommended petrolium oils. You will destroy that bike soon enough. Synthetic wont help you, and it will make you less of a squid than you aspire to be.
2. Byway warriors: Tremendous feats of speed in the straights, your nuts on fire and a silent scream in your throat through the twisties.
***Try a synthetic blend. I like honda hp4 without molly. This gives much less friction to the pistons but enough to the clutch to prevent slipping.
3. Mature enthusiast: The older you get, the better you were.
***Assuming your bike weighs less than 600 lbs. a full synthetic is great for you. You will promote engine longevity, and still enjoy the awesome power afforded by most bikes produced today.
A quick note to those who run full synthetic, fall into one of the first 2 categories, and have experienced no problems and would take issue with my words of wisdom. You suck. You cannot ride. Get some skills. Do not post argumentative banter here as I will embarrass you. Thank you in advance.