Honestly, both are worthy (Rulk after buff is even more worthier than LC after buff). However, a 4* 5/50 awakened DV will serve you well in many occasions, you can't go wrong with him since he is already awakened. (If he is not yet awakened, and you are not going use gem on him, then I will say Rulk first). Good luck and cheers!
p/s: Once again, both are very worthy in your situation, no surprise if the votes are pretty close. Hope you have enough resources to rank both up not too long after one another
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p/s: Once again, both are very worthy in your situation, no surprise if the votes are pretty close. Hope you have enough resources to rank both up not too long after one another