The only adventure I've gone through with Samus was Super Metroid and I greatly enjoyed it. However I was immediately dethroned for me by Metroid Dread. The visuals are positively stunning, the bosses and enemies are a tough challenge, the secrets you can find in every corner are rewarding and give you a sense of accomplishment and power, the music is brilliantly done, the game is (for the average player) around 8-11 hours long which means when you master it you can breeze through it in a few hours. This narrowly claimed my game of the year (with Halo Infinite being nearly, nearly as good of a game) but honestly, it deserves it and I am patiently (not really though) awaiting for Metroid Prime 4... I'll just have to wait about six years, but it'll be fine!
Review of Metroid Dread
