That top was a ms400 with an 18” bar.
Takedowns I use a 194t which has had the exhaust opened up and retune. Runs links a scalded greyhound. Very strong saw and much better than any of 201t saws I have used.
I also have a MS 200t which has been fully ported with timing advance. I use that occasionally just to give it a bit of exercise but mostly the 194t.
Pruning I use a 150t that has had the exhaust opened, timing advance and retune.
If it warrants it I will get the 441 or 660 out of the truck but if I am contract climbing for a mate. I use what ever big saws they have. Usually a 500i or a 661.