When my hot end heats up first, it drools while waiting for the bed to heat up.
When the bed heats up first... well, nothing bad happens!
I believe that the machine would know how long each takes to heat, and start heating the bed first, then start heating the hot end at just the right time so that they both reach temp at the same time. Short of a "smart" solution, a simple offset like "start heating hot end when bed reaches 90% of target" would work great. Less drooling, more clean bases!