Fluent vs Realflow for simulation
 

Hi there I'm new to fluid dynamics but have some background history in 3d.
I'm wanting to conduct some as accurate as possible fluid dynamic simulations using one of these programs. The simulation I intend on creating requires a calm body of water to be displaced by a large heavy mass traveling and impacting upon it at terminal velocity. Which of theses programs is likely to calculate the physics of such an event/simulation with high level of accuracy. I understand both programs use real life physics engines which enable you to input a lot of component characteristic information such as viscosity, mass, speed etc. I would appreciate any advise from advanced users of these programs who may be able to assist with their knowledge.
Thanks :)