I spent a long time deciding which saw to buy, it’s quite the minefield if you don’t know what you want.
As someone else above said, Husqvarna and Stihl are your go to brands. Or Jonsered which are re-licensed Husqvarna or so I gather. Those brands hold their value well, and have good dealer networks. There are some very good fakes out there though so be sure to buy new, or used from a dealer. I have tried bootleg Stihls, and Mitox, which is kind of a legitimised chinese saw….absolutely terrible.
About 95% of online info on chainsaws seems to be debating which is best, Husqvarna or Stihl. To no avail really. I got the impression that the massive Stihl online presence was down tho them being made in ‘Merica rather than them being better in any appreciable way so don’t waste your time with that. All the farmers I know swear by Husqvarna, but Stihl are a good saw.
Bigger is not always better. In fact a big powerful chainsaw in inexperienced hands is a terrifying prospect. Also consider whether you will be using it all year round, and what features might suit occaisional use or regular use.