really depends on you. last month, all I really wanted was the Titan helm and the pulse rifle. I only have a titan and warlock, and once I realized the way to play IB now is to get the three challenges done on each character and then stop for the day, it became pretty easy. I never thought I'd get to rank 10, but again, I realized once you get those 3 challenges done, you have 21 coins right there (plus either 5 per win or 2 per loss you obtained while getting challenges done). move on to your next character and repeat. you are better off doing this than staying on one character for hours. that being said, I played on both, but turned in all my coins on my titan, hoping for the helm. got to rank 15, but no helm and no pulse. kind of pissed me off, but now I have a reason to play. today, I got challenges and call to arms done on my 'Lock, turned in coins and first reward was the titan helm! so now I will turn everything in on the warlock. maybe get some armor for him too? the RNG sucks in this game. we all know it. just relax and have fun with it.