i too started on lsdj and got nanoloop carts afterwards. it's really easy to make long melodies in lsdj, and it's not really an option in nanoloop unless you exclusively use the song mode. because the rom's workflow, it's a lot easier to make things shorter (one or two measures, as opposed to the often used four or eight in lsdj). it's also a lot easier for me to make simple/loop-based stuff, it's kind of hard to make musically complex melodies and things like that.
i'm not sure about you, but i bought nanoloop 2.6 because of the sound capabilities. if you feel like it's limiting your songwriting, you should try lgpt. you can get even more sound textures, and the program's workflow was based heavily off of lsdj. hope this helps!
