So I decided to do the challenge. Initially I did an hour on the BH2 - which I really enjoy as a glass-cannon build. It's going to have a nice DPS bump when the Gauss reverts back to 4.5sec cooldown. However, this evening, I decided to spend another 2 hours playing and finish the tournament. I switched to the 5D. Now, excepting those matches where you get a team nascar'ing to their death or random guys that decide to walk through you and clip into your fire as the netcode freaks out, the games in the 5D were quicker and were easier than in the BH2. The speed and firepower of the 5D approaches the Timberwolf, its hitboxes are good and overall, it's a solid mech in solo queue - you'll carry with its speed and excellent sustained DPS. It's too fragile of build with an XL engine in competitive play, but hey, nothing is perfect.