Different games, Son of the forest is really new and has not much content to be honest.
If you want to play a game that has high quality graphics and some realistic mechanics you can see the Sons of the Forest.
BUT! Valheim is a great game that doesnt needs a high end pc, offers lot of playhours and even if you finish the game, you can join servers and play more than never.
I had like 300h in valheim just in vanilla with friends and now im around 2200 because i joined a RP server and daaaamn... the amount of stuff you can do in this game with just a couple of QOL mods and lot of peopel around, nothing that SonOfTheForest can do.