Good point, and I used to choose almost entirely by theme, which was probably my least scientific method ever. Now I compare the small details first, especially the minimum bet and how many paylines or ways to win a game has. I also like having a free-play option because it lets you get a feel for the mechanics without immediately risking money. A useful place to browse different styles is
https://kolikkopeleja.com/, where you can spot everything from classic fruit slots to newer video and 3D games. Much easier than picking purely because the logo looks cool. I’ve definitely made that mistake before, usually after saying “just one spin” five times.