There is no single best MSI gaming laptop for everyone. Katana, Cyborg and Crosshair models can suit mainstream gaming, while Stealth, Raider and Titan provide options for users looking for more performance, portability or premium features.
Consider the games you play, the display refresh rate you want, the amount of storage required and whether you need the laptop for creative work as well as gaming. The graphics card is important, but the processor, cooling and memory also affect performance.