Better, because it is free and secure. And at same time you are torrenting, you are helping the network. But a downside, it is the speed and amount of peers you find is less compared to the clearnet. Also it is not the best option to surf the clearnet, tor is better at this.
I don't understand what the down votes are for. Disagreement? What's wrong in hoping for improvements in a 13 years gap? I understand and agree that BT over Tor is bad, but two doesn't conflict.
There have been improvements, just on the fronts you haven't been looking for. Also, if I am correct, torrenting over Tor would be painfully slow compared to normally doing it or via a VPN. It is not worth the hassle.