Either one should work, as stated.
I've always been an Echo guy. Bought a Stihl once and didn't like it due to it being tough to start when first purchased. I'm sure it needed to be adjusted but I ended up taking it back, got an Echo and never looked back. That was 25-plus years ago. Have had roughly 10 Echo gas products since then. Never had a serious issue with any. If they got wonky, I did the tune up or carb rehaul and it fixed. Sold a few a decade or so ago, then bought new ones again a year or two ago. They start right up and now I'm using better gas.
Echo has a better warranty -- 5 years for consumers.
But with that said, if you find a good deal on a Stihl or like its features, there's probably nothing wrong with it. Just run good gas in it. Most Ace stores sell them and will provide better service than the typical Home Depot if you want that. Or, you can get either at a small engine dealer -- which is what I recommend.
Whichever way you go, two things:
1. DO NOT run the canned gas. Youtube videos with small engine mechanics have shown that stuff to be junk. Find ethanol free gas and get 2-5 gallons and use that.
2. Let the engine warm up for a minute or so before going to town with it. Just let it idle or trigger it gently. It will extend the life of the unit.