Dark isn't always bad. When I pick a shaft for my personal cue...I normally pick the darkest wood. As a general rule the darker wood will be more dense & play better. Provided the shafts are the same...weigh them and tell us what they weigh.
Also it looks as though some of the laminations on the darker one are wider and not as uniform...although it could be an illusion in the pic. I have noticed that the newer OB2 has much smaller laminations as compared to the wider sections on the OB1.