ijon,
     In my opinion, you hit on the 2 best brands in the business.  I have a PM250, as does Marty.  Marty has/is doing his best to help me with the few small troubles I have with mine.  It is well built, but if I had to do over, and could get away with it here in PA, I'd buy a conventional OWB.  A P&M ML36 would probably be to my liking.  I'll work through my small issues.  When clean, they work as advertised.  If you think you will not mind cleaning on a regular basis, then get a gasser.  Every 4-7-and if your lucky, 14 days and then a thorough cleaning is required to keep burning clean.  Excess smoke and poor heat transfer, ie long burn times all signal cleaning time.  I also have a problem with creosote build-up and am burning grade A dry hardwoods.  
     I do regret spending the extra for the gasser.  But, I have no choice but to live with it. 
     Do yourself a favor and stay conventional.  
Bill