I have seen no difference between soft and hardwood
Find one that works for you in your price range
I have burnt pellets for the last 20 years
The best I have burnt is hardwood and the worst was a softwood
So now all I buy is Cubix 9000 BTU per pound 0.4 % ash
They stay the same year after year Best bang for my buck
30+ for me. I actually wore out my original Englander stove.
I remember when I started out, pellets were 100 bucks a ton and there wasn't much choice either because no one was using them. Times have changed a lot since then. I remember I vented it with a metal plate in a window and a couple short lengths of pellet vent (Duravent) and if the wind blew the wrong way, the house smelled like wood smoke.. There was no PFI premium pellets, PFI didn't even exist back then and I was a member of the IBC (defunct) forum back then. Firepot Pete was on there as well.
I tried corn back then but the Englander didn't do well on corn. Most people had Amaizing Blaze corn stoves and one gal burned the shells from Walnuts.
I told myself that I'd buy a true multifuel unit that was corn capable and I did. Still have it. USSC 6039 HF and I run 2 burn pots. One is soaking while the other is in the unit. Same feed motor that came with it, same draft fan too. I've replaced the room air blower once and the 'fake' brick panel once and the view glass had to be replaced which was my own fault from closing the door too hard and cracking it. I put grease fittings in all the reduction gearboxes and they all get greased every spring. Firepot Pete runs a clinker pot he designed and had his son build and his and mine are both manual light, little handful of pellets soaked in liquid firestarter, a match and it's good to go.
Back then we could get cherry pits and I tried them with mixed results. They burned way too fast with too much ash. I take it completely apart every spring, grease the gearboxes, oil the fan motor bearings, clean it out real good inside and spray Stabil fogging oil in the firebox so it don't rust too bad (corn makes nitric acid vapor) so you have to coat the bare steel inside or it rusts bad over the summer. I take the venting apart and pressure wash it inside, put it back together and call it good. I don't ever seal the pipe joints either, other than a coat of never seize so I can get them apart easily. Never had a smoke leak issue. My venting is via a 3-4" cleanout Tee outside with 18 feet of vertical 4" vent and a rain cap up top and the stove has an outside combustion air intake, screened for bugs of course.
Stove has saved me thousands in propane costs over the years. I do heat my farm shop with propane (PEX in floor heat) when I run out of used motor oil (that comes from the farm tractors and the cars). I have a Kleen Burn waste oil furnace. It usually lasts until about February and then I'm on propane. The Kleen Burn combusts everything from gear oil to brake fluid to hydraulic oil, nice unit. Not cheap but worth every penny. I like working in a toasty shop when old man winter is howling outside. I keep my motor home in the shop as well so I have the motor home kitchen and frig available for snacks or hot coffee, or a place to take a snooze if I want to. I 'pretend' camp in the winter.
This unit should outlast me (hopefully). Being 71, not a helluva lot of time left anyway.