If it were me, I would look at neither of those saws. New user with a 390, or even 372? And only owns 4 acres? That land will be clear cut before the first spark plug change with a 390. Not to mention the safety factor of giving a new operator more saw than he can handle.
I have 200 acres, and have heated exclusively with wood for the past decade. Have a Stihl 021, husky 55 rancher, and husky 346. Recently bought an Echo 590 and a Stihl 362, but only just last month.
If I didn’t own a saw and was in the OP’s situation I would look at nothing bigger than 60cc. My 590 echo is surprising, even running back to back with the Stihl. My 55 Rancher was my only saw for about 5 years, and did fine with a 20” bar. Now that I have the bigger saws I bumped it down to a 16” bar though.
Also, OP lives 4 hours away from me and likely has similar forests. My friend has been a professional logger for 20 years and has a 2-saw plan to bring in the woods with him. A 390xp that he cuts with, and another 390xp that’s in the skidder in case he has a breakdown. I find it hard to believe that a firewood cutter needs a bigger saw than a logger.
I’ve ran my friend’s 390. It’s an animal, and I wouldn’t recommend it to most people.