Safer??
If all else is the same, and at a high level, the a twin is safer than a single.
However, if the skill level of the pilots is allowed to fall, then the single is the safest machine, because it is simpler and better mannered.
It is however strange that "suicidal turnbacks" that have killed many, suddenly became safe when the single engined turboprop came along.
And the PT6 (which is a good engine) was suddenly deemed infallible even though there are known failures and forced landings in Australia and overseas.