Personally I went with the Big buddy. even if I was looking smaller Id still get the big buddy great unit exceptional for ice fishing esp with the fan part you can get a 6 volt battery cheap and the foolish thing ran 40 hrs on it But!!!!! I do more than ice fish and live in a very cold area and if the power goes I will have great heat for in the house. camping it has uses too but for a emergency heat it is the best. only propane portable heater approved for indoor use!
Just another thought for you in your decision making process
(PS I also have other backups for my house ( generator, Solar battery bank connected on inverter. supplies power to pellet furnace, coffee pot, 1 outlet, and to the TV satellite) oh and a outdoor light Messes up the power company guy looking for the power interruption lol