Not directly related to charging rate, but...
Personally, I would recommend you use the "Hilltop Reserve" setting on your Bolt EV, if you get the car. That will charge the battery only to 90%, which should prolong your battery life if you care about that sort of thing. Of course, when you know you'll need a full charge, you can disable this setting the night before and let it charge to full.
The Volt inherently does this, with the "full charge" topping out around 80% or a bit higher, and with "empty" being somewhere around 20%. Keeping the battery further from experiencing fully charged and fully discharged states for long periods of time helps extend battery life.