I see most top runners run on pc, does it have an advantage? Or a console (like switch) is just as fast?

PC has the small advantage of being on the most recent patch, so all wallbounces have an extra 2 pixels of leniency, but aside from that it's basically the same.

There isn't really a strict advantage, outside of being on the latest patch and being the first version to receive patches, but the PC version has much better accessibility and supports multiple controllers, as well as keyboard.

It's generally just the overall more comfortable version for most runners and you aren't locked into Switch-only controllers.

Pc has the most recent patch and thus the most up to date possibilities. Some QOL things like cornerboosts and easier wallbounces (or seeker explosions triggering lockswitches) are not on console yet.

Plus, it is easier to get your preferred control option (controller/keyboard) and its MUCH easier to record or stream gameplay since you dont need a capture card.

As far as getting the fastest time is concerned, PC has a small advantage over the rest. But add all other extras, id say pc is the best choice if you want to take running the game super seriously