Follow-up to my previous post---
I'm an old geezer like you and don't have much experience with chain saws. Read enough about chain saw safety to make me a believer in wearing protective armor and a face mask.
Last summer I had a chore to remove a dozen 3-4ft tall stumps from what remains of my almond orchard. Went through the same tradeoffs you're making now and here's what I decided is best for me.
Bought a Remington electric chain saw (about $70) with a 16" bar (117 VAC, 11.5 amps). Reason: don't like little gas engines 3 feet from my face (noise, vibration, smells bad). And this saw is really light weight, a plus for a senior citizen like myself.
Used that saw to cut the stumps, some of them over a foot in diameter. No problem. Just take your time and let the saw do the work.
Fortunately the stumps were close enough to the well house where I had provided a 117V weatherproof duplex receptacle for this type of situation. I could reach the stumps with about 100 feet of extension cord.
If necessary I could have used my Coleman Powermate electric generator (117 VAC, 25 amps, $350 at Home Depot) to run the saw. That way I could keep the gas engine noise away from myself and work in relative comfort.
Just some ideas and alternatives.