One thing to consider is the pellet stove will likely only run for 24 hours unattended without being cleaned or refilled. I have a 55k BTU pellet stove and while it's great when I'm home, I still need to run the boiler when I'm away, even for an overnight.

Replaced our two oil boilers with an autoloading pellet boiler on 2 zones 3 years ago. Best decision ever.