About 14 years ago, when I finally bought myself a chain saw, I was heavily influenced by 2 factors.
1. I'd seen, firsthand, how smaller Poulans, McCullochs, Homelites & some others just didn't hold up when the going got tough. Among these- a 14" bar McCulloch Dad bought about 30 yrs ago. When it got stolen we didn't really mind very much.
2. Almost 20 yrs ago, I spent several months in NW Montana. Logging was the only real industry there, people knew chain saws whether they logged for a living or not, and virtually all the saws I saw in use were Stihl, Husqvarna, & some all-red ones(Jonsered?) that was supposedly made by the same company as Husky(or maybe Stihl?).
So about 1996 I caught a Husqvarna Father's Day sale, back before HD & Lowes sold 'em, and bought a 51? cc, with an 18" bar. I figured it should be more saw than I'd ever really need, and it has zipped right through everything I've used it on. It does need the chain sharpened or replaced now though.
A few yrs after buying the Husky(1999-2001?)we had one heckuvan ice storm in our area, Nat Guard called out in Texarkana, it was a mess. No telling how many small displacement, light duty Poulans, McCullochs, Craftsman, Homelite, & other little chain saws died in service- but it was thousands of 'em I bet, with many of them brand new. No foolin'. The Husky & Stihl independent dealers sold out to the bare walls on chain saws & couldn't get enough to replace 'em. My 51cc Husky cut through the ice & frozen big oak limbs(~10 to 13" dia)in our driveway easily.
So what would I use- or want to use- if the you-know-what hit the fan again here? My Husky will do just fine for me, thanks. If it had to be replaced? I'd look at current models from Husqvarna and Stihl, with engines from about 45-50cc up to 65-70 cc, with bars from 18 to 22". And probably nothing else- unless a side-brand from Stihl or Husky!
**Oops, I forgot- I'd probably look at some of the heavier-duty Echos too. Never saw those back when I bought my current saw, but Echo seems to build good stuff too.