I have both and would say it's personal preference ultimately. As long as your incubator and rack are together, having a Herpstat II is nice. Only 1 thermostat to worry about. You should still have 1 with a single probe though. I have a complete setup for a quarantine system that includes its own thermostat. Total, I have 6 different thermostats. 1 is my Herpstat II, the rest are single probe. Hope that helps.
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