I'd stick with Sthil or Husqvarna based on reliabilty/parts support/safety features- though I have no ownership experience with saws below 50cc - each are good brands, & each brand/moldel feels a little different in your "hand", so it all comes down to personal preference, dealer location/relationship each ...IMO the Husky in small saws fire up far easier & their startup/shutdown controls & maintenance are more intuitive for operators, nothing against Stihl's it just seems small Husky's are just a tad marginally better in these areas (conversely I find in large saws the Stihl fitration system far better, staying cleaner in heavy all day applications)
As general recommendations, if possble buy a slightly bigger than smaller saw, don't be talked into too big a bar (with experience/thought you can cut at least double the bar length less c2inches without drama), make certain the chain oiler is adjustable,, for longevity get a bar with a greasable bar sprocket, dismiss any saw with a "quick twist" chain adjustment, nothing but trouble - stick with the proven screw/2 nut adjustment, run the saw on premium 2 Stroke @ 50:1 non-ethanol fuel/good bar oil/clean filters/& a sharp properly adjusted chain....& it should last at least c.10yrs+.........and if you are going to store for a month or more, empty the fuel from the tank & run the saw till out of fuel (2stroke fuel goes off very quckly & any aged fuel left in the saw will lead to starting woes longer term).
In trimming or any applications don't be tempted to cut from a ladder or above shoulder height, use a chainsaw only with both feet on the ground & if you need to go higher use a pole saw....the smallest chain saw is still capable of of inflicting serious injury just like their bigger brothers, & in some respects trimming with small saws you are more likely to encounter kickback, jamming ...etc...so take your time & use them wisely.
We own/operate many saws on our farms, & with 35yr+ professional rural chainsaw use & logging experience have tried most of the mainstream brands over the years & a few "throw aways" too....a sharp chain & a patient safe operator who plans their cuts will make up for most limitations of saw brands/models/size.
Good luck & let us what you decide on, why & how you find the ownership experience