Agree with the rest. Wanted to again emphasize that the "big shoulder" look does NOT come from big delts.
Certainly, well-developed deltoids are necessary, but more than that you need thick traps, wide lats, a broad chest and back, and a narrow waist in order to pull it off completely. And of course, you would look ridiculous with a thick torso and shoulders with skinny arms.
In my opinion there's no lift that makes you thicker than heavy deadlifts. You also need to move weight on your bench, rows, and pullups. Squats will help with the core development, but don't directly contribute to the broad shoulder look.
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