Do heavier blades have an advantage?
Yes, but there is a disadvantage too.
https://deltamotion.com/peter/TableTennis/Mathcad - TT Physics, Paddle Mass .pdf
The plot shows the speed after contact assuming a flat hit. The ball is incoming at 10 m/s and the paddle is moving forward at 20 m/s.
One can see that a 200 gm paddle is not twice as fast as a 100 gm paddle but it is faster. The disadvantage is that because the paddle is twice as heavy it will take twice as much energy to get it too speed and twice as much force to get it to speed in the same distance. A question that should be asked is can I swing this lighter paddle faster to make up for the lack of mass. Possibly. The paddle's mass is small relative to the whole arm and body so just because the paddle is half the weight doesn't mean if can be moved to twice the speed. There is a limit to how fast you can swing your empty hand. Everything is a trade off and it depends on the person. A muscle bound weight lifter may not be able to swing fast anyway and would barely feel the difference. I smaller lighter person would probably benefit from using a lighter paddle that they can accelerate more easily.
One should always ask why if a 200 gm paddle is better then why not a 500 gm paddle? Now you can see a 500 gm paddle is faster but it will require 2.5 times more energy and force to get it to speed.
The point is there is a sweat spot and it lies in a range of paddle weights from about 160-200 gm but different people will find different paddle weights suit them the best.
However, looping is not done by flat hitting. It is done by brushing with a closed paddle. It is the paddle speed tangential to the ball that will make the most difference as the contact gets thinner and thinner. When the paddle is angled closed 45 degree and the swing is in the same plane you don't want a fast normal paddle speed because that would make the ball go down into the table or net. It is the tangential force generated by the rubber ( upwards )that keeps trajectory of the ball from going into the net. In these cases I would prefer a slightly lighter paddle to get more tangential force.
So basically, just get a paddle that works for you. Many will do if you are brushing balls because rubber is much more important than the paddle.
One more thing. Always question anybody that says harder is faster than softer or heavier is faster than lighter.
There is a reason why rubbers and blade characteristics are in a small range. There is such a thing as too much and too little. So what makes the next new rubber or blade so fantastic that it can be an outlier with no adverse effects or is it really any different that what has come before.
