They are blowing smoke up your azz, yea, maybe the 372 and 390 might be a little bigger displacement and their favorite saws because "they" run them. But you have plenty of saw to cut the amount of firewood that you are cutting. The 365 and 385 are two I'd cut with any day and be damn happy to do it. We'll cut over 400 cord and not use any bigger saws, if fact we use more 70cc and 50cc saws than anything.
It's nothing more than I've got this and it's better. I've got a couple of guys working for us that can take those two saws and cut more wood than the "experts" can load in a day. If you feel the need for speed send the 365 to Brad Snelling and spend 300.00 of so on the saw and put a 55 gal drum of wup azz on their stock 372's. Talk sweet to him and he might be able to find you a good used 372 cylinder and port it give their stock 390's a scare for a little more, I have no idea what he charges, but you can get 35/40 percent gains out of a strong woods port. You really have more than enough saw for fire wooding, even high production fire wood cutting, good lord, I can't image what they are cutting. You own great saws, ignore them.