Flashcart suggestion

What’s the best 3DS flashcart that will allow me to use homebrew on my new Nintendo 3DS system? There are so many choices out there and I just want the best one. My firmware is ver. 11.6.0-39U . I just mainly want to backup my game save to use on Citra, please help.

3DS flashcards like Gateway (DS flashcards that are compatible with the 3DS are different - they can be used for the ntrboot method) are no longer relevant, as you can backup your 3DS cartridge and install it as a CIA to your system, and there are cheaper methods to use other kinds of homebrew. https://3ds.hacks.guide/ is the best place to look, for homebrewing your system.