What is the most popular 3ds game flashcard?

General speaking, there are 4 kinds of 3ds game flashcards in the market:

SKY3DS

Gateway 3DS

R4i Gold 3DS Deluxe Edition

MT-Card

And among these 4 types of 3ds game flashcards, the most popular and used will be Sky3ds and Gateway 3DS.

Sky3ds is the new and hot and popular game flashcard in recent years.

Main Features of Sky3ds:

1, sky3ds can be used for gaming console NEW3DS/3DSLL, OLD3DS/3DSLL/3DSXL, 2DS.

2, sky3ds can be used for the latest 3ds console version 9.8.0-25. 

3, one sky3ds game flashcard can be used to play several 3ds games, there is no quantity game limit.

4, sky3ds support eshop VS Network.

5, sky3ds support CFW.

6, sky3ds support micro sd card 2GB, 4GB, 8GB, 16GB, 32GB, 64GB, 128GB SDHC/SDXC Card.

7, sky3ds support region-free that means you can use sky3ds playing JP games on EUR 3ds console or on the contrary.

Gateway 3ds is the first 3ds game flashcard created in 2013 which earns gateway 3ds a hot reputation. 
Main Features of Gateway 3ds:

1, gateway 3ds can be used for gaming console NEW3DS/3DSLL, OLD3DS/3DSLL/3DSXL, 2DS.

2, gateway 3ds can be used for 3ds console version 4.1-9.2.

3, gateway 3ds support CFW emuNAND system which support playing 3ds games  in latest emuNAND 9.8 and support entering eshop to download  games and patch the games online.

4, gateway 3ds support games .cia/.dlc/eshop/.3ds/.nds.

5, gateway 3ds does not have the region lock, that means it support region-free you can play JP games on an EUR console or on the contrary.

6, gateway 3ds support game card dumper, that means it can suck out game rom out from the console original game flashcard.