They both have their pro's and cons, I've a few hundred thousand km's across the globe each with both shaft's and chain's.
Thank you for expressing your personal opinion though.
Chains are objectively more efficient than shaft drives -- it's not my personal opinion.
The main benefits to shaft drive are longevity and ease of maintenance.
That's objectively more efficient to those that travel a lot in harsh conditions.
Opinions are almost always personal.
They both have their pro's and cons, I've a few hundred thousand km's across the globe each with both shaft's and chain's.
Thank you for expressing your personal opinion though.