It depends on what you want. I looked at and listened to both at my local dealer. Then went with the 100s because of cost. The 150s sound better. But, could not justify the expense. They also had the Fusion 6.5" w/ a spearate tweeter, they sounded way better than the 150s for about the same cost.
I run 75 watts a side to the 100s and can here them if the system is turned up loud when surfing and some when boarding, if it is not windy etc. But, I think some of the sound come from the rest of the system.
Hope this helps.