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Why do you feel that bodybuilders have so much more muscle mass than powerlifters even, in mose cases, powerlifters being much stronger?

Maybe is it the shorter rest periods, couple with the higher reps, leading to more gh production...

What do you think about this?

The professional bodybuilders have more mass because they use more anabolic

It is because there are 2 ways you can get stronger. One is Building more muscle to do a lift and the other is your CNS (Central Nervous System) being more efficient at turning on the whole muscle instead of just a portion of it and coordinating the muscles together for the movement.Normally a person only turns on about 30% of the muscle regardless of how much you feel like your straining.But when you train in very low rep ranges (1-3 Reps/Very long rest/as explosively as possible) your body doesn't have the necessary stress that breaks down the muscle to make it grow so instead of the muscle growing your body just starts turning on more of the dormant muscle that was off before.So even though a muscle could be 6 pounds only about 2 of those pounds are being activated for a lift.But with powerlifting your learning how to activate the other 4 pounds at will.This also can happen in life and death situations! That's why you hear about normal people lifting big weight in those situations.The adrenaline turns off some of the limiters your body has set on its muscles for the emergency at hand. Also they're 3 different types of muscle fiber (Slow Twitch/Endurance type and 2 types of fast twitch:one that acts as a middle ground between Endurance and power and the other being for pure power but has very low endurance).When your training more for strength (5-8 Reps/Longer Rest/Explosively) your muscles will grow more of the pure power type muscle.Between the Powerful Fast twitch muscle fibers and the CNS turning on more of that muscle and coordinating it/them better you have a smaller guy lifting larger weights then the larger bodybuilder. Ex: For a slow twitch fiber to lift 100 pounds it would have to be larger then a fast twitch type. Bodybuilders have more slow twitch and fast twitch type 1 fibers so they have to be bigger to lift the same weights even if their CNS was to activate all the muscle Properly., also they use more variety in their training so they CNS has less time to master the more basic strength lifts.A Powerlifter will spend more time training between the 1-3,3-5 and 5-8 rep ranges that build more strength then the bodybuilder would use and use fewer exercise (Legs) Ex: Back Squat,Front Squat and Split Squat mostly to master them. While a bodybuilder would use as many exercises as it takes to stimulate the most growth (Legs) Ex: Back Squat,Front Squat,Split Squat,Lunges,Step Ups,Leg Presses,Leg Extensions,Sissy Squats,Hack Squats and use a large variety of rep ranges but usually staying between 8-15 Reps! This means more muscle growth but less time to let the CNS master any of the lifts to the point of pure strength development but bigger muscles.

Bodybuilders have more mass not because they use anabolics. It's because it's totaly diffirent sports, bodybuilding vs powerlifting. Bodybuilders builds their body and composition, lifters - they need POWER.

Bodybuilding and weightlifting have similarities and differences and this will explain why bodybuilders appear to have much more muscle mass compared to a weightlifter who is much stronger.
The first similarity is of course, the lifting of heavy amounts of weights, however the difference is that in bodybuilding you might be in the gym 3-5 times a week lifting for up to an hour and a half using weights that are slightly lower than you could lift, so that you can rep more ideally 12-14 times. this builds up more mass while really not putting on as much strength. Whereas powerlifters lift more weight but do less reps (between 2-4 reps) and they have longer rest periods.
Both sports incorporate the idea of proper diets and nutrition. It is important to know that if you aren't eating the foods that your body demands after intense workouts, you won't gain the desired amount of muscle mass or strength.
Proper diet either makes or breaks a bodybuilder's appearance, and that is why it is imperative for bodybuilders make smart food choices. This is why a bodybuilder will appear to be a toned, muscular and athletic looking whereas the powerlifter may look muscular, but out of shape and "fat."
The truth is, a completely dedicated powerlifter will not care about his looks and will focus solely on the weight that he is determined to move. The lack of good body appearance may make him appear fat, but in his sport he is more concerned about how much he can lift.