Anecdotal but, on a small dose of LSD I was able to conduct a business meeting better than sober (short term memory and concentration greatly enhanced).

Meanwhile, I once had the bright idea of using marijuana to help me relax while working, and ended up delivering an entire street of mail to the wrong street.

So, if I had to pick one... On the other hand, microdosing worked for me only for a few weeks, then seemed to ruin my life (see my other comment in this thread) so I certainly wouldn't recommend that lightly either.