I mostly ride on the hoods - it feels a bit more relaxed than the drops. Today I felt really strong riding home and I was keeping up with the traffic (a 40 mph road but congested) pretty easily; suddenly, the congestion cleared and the traffic started to accelerate. I needed more pace but I was already roasting along; my legs didn't have any answers; I didn't know what to do - luckily my bike did. It whispered, "Get in the drops". Awesome. It just felt right.
To summarise: make sure that your bike is properly set up, then just ride where you feel you should be riding.
Hope y'all have as much fun as I did today.