In Stihl saws, pro saws are designated by the second number being even.
241 (discontinued in US)
261
362
400
462
500i
661
881
They are typically lighter with more power and are build to last without a clamshell plastic engine case like the homeowner/ranch saws.
Like I said before I have a 250 that I have used a lot (Aftermarket carb because the factory carb sucks balls) and it would easily cut firewood every year.
That said, my 261C will run circles around it. It’s twice the money.
The 362, it is heavy for the power. It will shred firewood if you don’t mind a little extra weight. It isn’t a great woods saw though. Mine runs strong.
271 and 291 are heavy for the performance and are clamshell designs but will do well in a firewood pile. Same saw different displacement.
A MS261C (Mtronic) is my advice for a lifetime saw. 18” 325 bar is the sweet spot. Keep the chain sharp to keep it from over-revving and burning up and run Red Armor at 40:1 (I run 32:1 in all and know it’s probably overkill) And it will outlast you.
A 251 with a sharp chain and good oil will probably outlast you too honestly so no shame in getting one.
I have a 241C, 261C, 362C, 440M and a 250, 291….a 500i before long.