Think that's the cheapest.. propane tank or properly hooked up to house natural gas would be cheaper than propane... i would want someone who knows what they are doing hooking that up, lol. End up one of those people embarassed on local tv talking about your "drug house" blowing up.
Greater connectivity.. remote control with app and data collection, otherwise not much different than adding co2 32 years ago. Doesn't matter how it works, as long as it shuts off at certain thresholds and alarms when it does not.. keeps you safe. I'm sure there's some that don't require wifi still :P