I have both simulators. I run phoenix more often, I like the interface better and they are constantly upgrading it for free. Either of the two are the best for helicopters, I have tested these two, realfligh G3.5 and G4, Aerofly, and FSOne and the two you are diciding between are the best for helis.

Phoenix can be had for cheaper too. In the US you can get it from Tower for 160ish -25 coupon only 135, not bad.