I used to run the thunder on both. The only thing I liked the Cheyenne for was not having the start up cable anymore. I think this feature is also in the new critical settings. It was really annoying having the machine ramp up to 12 volts then back down to your setting. I also didn't like the limitations on voltage setting on the cheyenne.Unless you are Die Hard Cheyenne for life. Critical is the way to go. To answer the question, It was just as smooth/aggressive on both power supplies to me.