Both very solid offshores.
At this time of the year with only a couple of weeks to go in the NHL and baseball still on the go, i would tend to go with pinnacle because of their tighter juice...Olympic offers some interesting props which are advantagous sometimes...
I also recommend
http://www.wsex.com/
for NHL next season...used them for last 3 years for this sport and are very solid also.
They offer :
Interactive Playoffs also and Unique Futures Markets on
Anaheim at New Jersey
Graduated Dime lines on baseball....
Hope this helps
IE