You would be fine to use the hatchling rack on the same t stat a your adults, the one you mentioned above is still an on/off type thermostat, I dont see one brand better than the other really besides cosmetics. The only reason I use herpstats is because the on/off type stats clicking on and off annoy the crap out of me, especially when you have quite a few. If you wanted to step up you could go with the VE200 which is proportional like herpstat or helix