N3DS, it all depends on your FW, if its 9.2 or lower and you can wait, wait for Gateway to release there N3Ds support in there next update (how long it's gonna take? only Gateway will know)
(For N3DS (and old 3DS)
+ Homebrew support
+ Regionfree out of the box
+ Emunand
+ installing cia files (if you know where to find them or how to make them yourself)
+ Game updates throu cia's
+ Online support (3DZ and cia)
+ If you f*ck up emunand, you can format and start over, or place a backup back
+ Fun for homebrew and rom hacking
+ Once configured, easy to use (you still have to be carefull when installing cia's or updating emunand)
+ Game limmit is the size of your SD in the 3DS
+ Multirom menu in gateway mode
+ Eshop games are supported in 3DS or cia
+ No need to buy a new Gateway, Gateway can be updated
- Emunand can be crippled by Nintendo, but mostly Gateway finds a way (for how long?)
- Emunand can't be higher then 9.4 (on N3DS only)
- You gonna need internet access to launch the exploit (9.x fw), so you have to be carefull for the update nag from Nintendo)
- No eshop access, cause you need latest FW from Nintendo on emunand (N3DS only)
- For piracy purpose also
- You have to be carefull when configuring the first time.
-/+ Lesser kids friendly then Sky3Ds/QQ3DS
Unknown till now -> N3DS exclusive games support???
If your N3DS is 9.3 or higher, or you accidently (or on purpose) updated to 9.5, Sky3DS/QQ3DS is your only option with only games of your own regio
(Be sure you buy the BLUE button version)
+ Till now survived all updates of Nintendo (for how long?)
+ Works out of the box (meaning you don't have to mess with sysnand and emunand)
+ Quick, almost weekly updates for there template file (needed to support new games)
+ Online support (mostly, but you can with a little googling add that yourself to the template)
+ Eshop access (as long as Sky3DS/QQ3DS works)
+ Homebrew support if your 3DS is 9.2 or lower (Not for N3DS)
+ You can install game updates for games on your Sky3DS/QQ3DS without problem (For as long as Sky3DS/QQ3DS works with latest Nintendo FW)
+ Regionfree throu an exploit
+ 31 games on 1 SD (you can use multiple SD cards)
+ Easy to write games to your SD with Diskwriter and backup/restore card1 and card2 save games
+ Fast switching (when using a descent class 10 SD)
+ Kids friendly
- No emunand
- No cia
- No homebrew (N3Ds only and 3DS if 9.2 or lower throu Cubic Ninja on your Sky3DS/QQ3DS)
- Can be blocked with a future nintendo update
- If Sky3DS/QQ3DS gets blocked you are stuck on latest fw it worked and lose eshop access and game updates
- No eshop games
- No regiofree throu the exploit (on N3DS only)
- Pure for piracy purpose
- Switching games, when you have alot, can take some time to get back to the 1st game
- You can't just randomly select a game (multirom like Gateway)
- Not proven till now if Sky3DS/QQ3DS can be updated or not (for now let's assume, not)
Unknown till now -> N3DS exclusive games support???
That's all i can think of, using the Gateway and Sky3DS myself.
You have to keep in mind, the biggest group of gateway users, use it for piracy (retail games and eshop games)(you can tell you don't but we know better), a smaller group really use it for homebrew and rom hacking), All Sky3DS/QQ3DS users use it only for piracy. (You can't tell you don't cause there's no other option!)
If you want to have a clear mind, keep buying the games you love!
Hope this helped you, maybe i forgot some things here and there, but i bet it will be mentioned by others