I believe that the House's are bad (since their mechs are horrible compared to the Mecharoni and Werewolf. However, if I had to choose, I would go with Runehawk or Wolfblade, since a big part of battles is your health. Enemies can drain your health pretty quick, and while Mystraven has powerful attacks and abilities, their starting mecha sucks (has horrible health and bad damage). Wolfblade is good for raw power, but with limited power and not enough special effects, you can't keep up fights for longer than 5 rounds. My advice would be to go Runehawk, since they rely on disabling opponents with things like energy-drain. Or even better, buy a better mech for less money, like the rabid werewolf or Mecharoni