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Hey Jamo, hows things?

I've got 2 questions today..

1. What is the difference between training with the same weight for all sets (ex. 4 sets of 10, with 15 pound dumbells) compared to training while pyramiding down the weights and increasing the reps for each set (ex. set 1 - 15 pound, 8 reps, set 2 - 10 pounds, 10 reps etc)? And which of this following methods is better for gaining mass?