Generally, any mech is going to have a bullseye on it, if it is the only one the enemy can see
If you like to tank, then that means armor and internals. That rules out the Jenner, which is about speed and -avoiding- damage. The Hunchback and Catapult are actually close cousins of a sort. In their default Primary configurations, the Hunchback is a defensive interceptor, designed to get in the way of an attacking mech and make them either halt their attack or suffer heavy damage. It can operate as a close-in fighter as well. The Catapult is a fire-support unit, designed to launch missiles over the heads of their team to strike at enemy units. It can also operate as a close-in fighter, though slightly slower in reaction time to the Hunchback and with lesser firepower. With customization, however, both mechs have a wide range of possible configurations, with the Hunchback having a Ballistic/Energy weapon profile and higher possible speed, and the Catapult having a Missile/Energy weapon profile and a higher possible armor level.
The Atlas, by comparison, is very heavy on the armor and has all three weapon type hardpoints. Its default configuration is capable of fighting in any range, and even doing light fire support. It will take the most damage and be able to throw out the most punishment of all the Founder's mechs. However, it's range of customization options is limited. It cannot ever move faster than 64 kph, and must bring the firepower to be able to take on the other Atlas's and Assaults it will be facing.
So, it comes down to what you like in a mech. If you want the ability to take damage first and foremost, and don't care about speed, take the Atlas. You will be a target anyway, so might as well pile on the armor. If you want something more multimission and like Ballistic weapons with an option for speed customization, take the Hunchback. If you want something more multimission and like Missile weapons with an option for more armor customization, take the Catapult.
Note this is limited to the Founder's mechs, with the c-bill bonus and custom skin. If this is going to be the unit you plan on being your 'main ride', then use the above. If not, then look over all the mechs we know about, and pick the Founder's mech that fills a role not covered by the other mechs you want to buy in the game.
Hope this helps.
Edited by Jakob Knight, 21 July 2012 - 05:31 AM.