A PC game running on any PC should play at the same speed, regardless of the FPS. FPS means how many times the state of the game is rendered in a second, so lower FPS means you see less updates, not that the game plays in slowmotion. If the game renderes as soon as it can, you can get a high FPS like 90, but the game shouldn't play like fast forwarding. When it uses VSync, the game tries to render when the screen is being updated, so it runs at 60 FPS (for 60 Hz screens) or 30, or 20, or 15. If it can't render as often as the screen, it renders one out of two frames (or one out of three, and so on).
Now, emulators are another story. Emulators usually have a frameskipping option. You can enable or disable frameskipping, and when you enable you can set it to automatic or a fixed value. The emulator will always render all frames for the game, and if frameskipping is disabled, the game will run slower than intended (if it manages to simulate 30 frames in one second, the game will run at half speed). Sometimes frameskipping is not enough, so the game runs too slow even when enabling it.
So, no, a pc game playing at constant 30 FPS on the GPD Win should play the same as it running at 60 FPS on better hardware. Emulators might run slower, but you can probably improve it changing some options.