If you live in a cold climate and want to pre-condition the Bolt and still have a full charge, the 32 amp EVSE can do the trick. I upgraded from my 16 amp because of my weekend usage where it is not uncommon for me to do 150+ miles in a day, and then want to do it again the next day. If you don't plan on using the bolt that hard (I have over 22,000 miles in 6 months, one 1000+ mile round trip road trip and two 2000+ mile round trip road trips.) you will probably be fine with the 16 amp.
Keith
Keith