What CZTOPS said.
There is no reason NOT to decock fully.
But there is also no reason not to drop the hammer to half-cock, either -- and ,as CZTOPS said, from half-cock position you start with a shorter, lighter trigger on the next shot.
Note: the decocker models drop the hammer to half-cock. That is considered safe. The decock models have a less robust sear than the non-decock models.
Do whatever makes you comfortable -- but practice, and do it safely.