Well, they might be the 1st to crack the n3ds key thingy I think, since they said they will soon have support for up to version 10.3.
Plus it's quite annoying using cia's mostly on the n3ds, since you also gotta unscrew the bottom cover each time (transferring via the ftp thingy is so fucking slow), and then you gotta install them which takes also a while. On the other hand, you need a private header for online 3ds roms, so you need to inject that, and if the manufacturer byte doesn't match then you gotta edit it again... The new cheat finding system is pretty awesome though, don't think NTR has that yet.
I think these are the only advantages. Oh and the constant support from the Gateway team.