Both are approachable when young. I tend to lean more towards 54. I find that it has some woodiness, creaminess (i love creaminess in cigars), lil hints of coffee & it's a well balanced cigar. Very smooth even when young. When you retrohale, tend to get some slight pepper at times. No harshness what so ever. It's medium in body.
As for the 50 which I have only smoked less than 5 sticks if I can remember. Last one was over a year ago, kinda leathery, slight creaminess(not as much as 54), some saltiness & burnt caramel in the first half of the cigar. I felt that it needed more tim