As a tech that worked for a small engine shop, yeah we sold Husqvarna and later added Echo, but we took a lot of other saws to repair. I purchased a 455 not long after they were brought out to the market. Loved the saw but did find it to the heavier to handle all day. Initially they had some carb and oiling issues, but changed for the better.
Sold that saw after I picked up a non-repair saw and repaired it with a 460 piston and jug, the rest of the saw is the same.. Eventually sold it when the ole back said "NO MORE!!"
As a tech repairing saws I always found the Husqvarna easier to repair than the Stihl for most models Parts were always harder to get for the Stihl of course, As we were not a Stihl dealer. Stihls inboard clutch has melted a lot of crankcases, Husqvarna uses outboard clutches, keep the heat away from the engine.
Check the chain speed, Husqvarna at least used to have a faster chain speed. Due emissions Husqvarna has gone to "electric" carburetor before Stihl had and last I knew had most of the bugs worked out.
If you were not aware Husqvarna was one of the first companies working with ergomics and anti vib.
I have not worked much with Echo but I always found them to be a good saw.
Check out the Husqvarna 455 and 460 good saw decent homeowner price. For a Pro saw I liked the older models believe they are 562XP, 395XP, and 372XP X torq. All good but a steep price.
So you are aware I had to retire the end of 2020 due to a disintegrating C4 that screwed up my neck and nerves. Got the neck fixed but the nerves were damaged and aren't working right. Oh well lots of time to sit on my grandson.
I would recommend taking a look at any saw you are interested in and if you can test drive one before any purchase, that way you will know which saw you prefer, and don't forget to consider parts and service. You don't need the counter person to say, "It will be four weeks before we can look at it" or " the part has been backordered for six months already and they have no idea when it will be available". Yeah, it happens.
Have a wonderful day and enjoy your new saw!