Which is better for airsoft? Sniper rifle or Assault rifle, we play in a large area?

We have alot of cover, but its only like 2-3 people on the enemy team. We play at my friends house or at a long field with a road to the east and woods to the north/south/west side of it. AGM Metal Bolt Action AWP L96 Airsoft Sniper Rifle - OD Green - WITH 9x32 SCOPE AND BIPOD - Enhanced 2009 Version(thats the sniper i want...from airsoftmegastore.com)....JG Airsoft Full Metal Gearbox AK47 Airsoft AEG Rifle - LATEST ENHANCED 2009 VERSION (Assault rifle...same website)