Sounds like you have a little problem with this decision making process
Plate Steel vs. Cast Iron eh?
I like my Jotul, I like the cast iron look, only problems with it thus far is the front door is about useless as each time you open it ash falls out all over the place, I use the side door only.
Hmmm, oh yes, the air adjustment lever, myself and several others have had a problem with it sticking, being difficult to adjust/slide back and forth. I've had to get into it and put graphite powder on it a couple times, has not been a terrible issue and seems to be ok now. Others have had a more difficult time with theirs I believe.
Also, I did re-do some of the seams inside the stove with rutland cement, about halfway through the season, because the original stove cement was sloppy and I'd hit it when running my poker in there, thereby loosening it up, resulting in my re-doing some of it.
Otherwise a heavy duty heater, takes a 22 inch split, burns down overnight but leaves plenty of coals for a morning re-start, glass stays clean of black soot, but gets hazy over a week or so, I just clean it with a sponge of water, no problem.
I can't help ya on the Lopi, though I've heard they are a great stove, possibly if I were single I'd be loading a steel stove, but my GORGEOUS wife does not like the look of the "boxy" stoves
I can't blame her for that, our Jotul is a very prominent feature in our home, and it sits there day and night ya know.
My number one desire was for a wood heating unit that I could crank up whether the electric was on, or off. Looks like the Lopi fits that bill as well.
Good luck.