Micro SD card?

I’m buying a Switch today, and I know I’ll need to expand on its storage. I’m probably looking for a 128-256 GB card that’s fast enough to transfer data to the device so I can enjoy my games without any lag, and one that won’t break the bank.

I know they aren’t original but i was wondering if they are good enough. I want a high speed sd card (>=70mb/s) but when I see the reviews on an 80mb/s one the speeds vary from 20-80mb/s.

I’m so confused on the types of Micro SD cards there are. I want the most capacity storage I can have as well as the fastest best quality. Is the 256 Extreme a good choice. I know there is a 400gb one but what I really dont understand is the different “models” of the same size storage. Can someone please help me understand this.