For 10 acres, the Dewalt and it’s similar would be fine. Pretty much whatever line you’ve invested in. Unless you’re cutting for a wood stove, you won’t be doing much cutting all at once. Unless it’s after a storm. Have batteries charged in advance of a storm and you’re good. And for trail riding, and post storm blowdowns, you know it’ll start. Slightly less stuff to pack on the quad and a lot less mess. You can even charge Dewalt on 12V in the car/quad now.
Bigger falls just need more time with a small bar or lower power saw. Remember, even the handsaws will do the job.
You can run used motor oil for bar oil. The used synthetic is nice in winter. If it’s cold, drag the chain on a log a few rotations before starting.
Use TruFuel or similar if gas. Otherwise highest octane and mix a little Heavy on the oil side. Swing by you small airport nearby for AVgas for best stuff. Not the gas station.
Typically, I do three strokes with the file each tank of gas. You can mark a tooth with a marker so you know when you’ve done a full round. Do one side fully, then switch. Don’t alternate as you go. You can watch you chips to see when to file. Sawdust size, sharpen, chips the size of the lightning cord tip, you’re good. Don’t expect the long curly shavings. It’s a rare thing and goes away fast anyways.
Consider a shorter bar than the saw comes with. More time limbing than felling and the little less weight and maneuvering pays off.
Buy the Kevlar pants or the chaps. Chaps are a pain until you get used to them. If you and the wife have different lead off feet, then one pair is fine. Only one leg ever seems to get cut. Get the highest speed you can find.
Wear the steel toes. Bars love to find the toes.
wear the hard hat, muffs, and mesh shield. Too many eye injuries without it. And if you’re felling in dense stuff, or just blowdown, crap will find your head. Gloves, More just what’s comfortable but durable.
Buy/keep an extra bar & chain handy. WHEN the saw gets stuck, you have a spare saw to free it.
look for how the tree and branches are under tension when cutting. Compression cuts on top before cutting from underneath help and give notice to pull the saw.