Hi there! I'm procrastinating and recently accepted my offer to Columbia chemistry earlier today (came across here by searching columbia lol)
I spent a summer in Berkeley so I got to hear all the good gossip about the school. I should preface and say that I'm not in synthesis, but the grad students told me all about the synthesis groups at Berkeley. I think unfortunately, as it seems to be, synthetic work gets the short end of the stick out of anywhere you go but in Berkeley it seems especially bad. Its very physically demanding and the science takes an excrutiatingly long time, so its just the nature of the work.
That being said, one might hope that a professor doesn't schedule group meetings on weekends. Several Berkeley professors do this, sometimes late into a Saturday to insure their students are still there. One might hope that a Berkely PI graduates women at as equally as the men. Some Berkeley professors do not do this. Some Berkeley professors have a history of being at other schools and climbing the ranks to get to Berkeley, effectively abandonding their students, claiming 'they weren't creative enough', forcing students to restart or leave their PhDs. I don't want to name any names, but in the remaining time you should probably reach out to grad students in the labs you're interested in and see how the professor exerts pressure on the group.
I had a friend who ultimately rejected a certain professor at Berkeley who really wanted them to join, so as soon as they rejected Berkeley the professor turned very very nasty. Luckily they dodged a bullet.
Columbia's synthesis isn't entirely innocent either but I don't have enough information to say anything. When I asked about bad groups they told me since I'm not in synthesis I shouldn't have to worry about it.