Most effective in pve combat is either the Krait mk2 or the challenger, which also coincidentally and conveniently give the the choice of big barge feeling (Krait) or mini cooper feeling (challenger) both of these ships are more effective than the big ones at clearing combat zones, arguably the highest level pve content. The challenger must be used as a hybrid and is an incredible bullet sponge. The Krait can be effective as either a hybrid or a shield tank, but until you unlock prismatics, stick to hybrid.