Stihl and Husqvarna tend to be A+
IF you are buying their professional grade saws. Not that their other saws are bad...but a professional Echo is going to be better than a "homeowner grade" Stihl or Husqvarna.
@Tigwelder83 's suggestion for a (higher power) battery saw is a good tip. I'll convert to all battery for in-tree saws in the next year (big chunk of change...but I'm convinced it will be worth it). However, I wouldn't want a battery saw all day long in the woods when I'd normally use 6 tanks of gas.
I almost bought a Husqvarna 543XP for doing grapevine and small invasive shrub removal. I have a Stihl MS261 that is great for that .... when it starts. It has been a bear to start sometimes - even after having it back at the shop. If I were buying that size again, I'd probably get a Husqvarna 550XP. The 543XP would do that stuff and be lighter to carry around the woods which is why I looking at that.