yeah lsdj isnt produced anymore since some time I think. lsdj is more of a tracker version compared to nanoloop. but I am really satisfied with nanoloop, you can do everything with it, just in another way, and the presentation of it is just eye candy
btw, do yourself a favour and by an old grey model for some bucks, because it sounds the best. I tested it on all models, and advance sounds thin compared to the grey ones. or do programming on the advanced (for the comfort) and recording on the grey (for sound).
or did you refer to the different versions? then if you really like 8bit sounds go for the older version (1.3) and if you want to have a portable softsynth you should go for the newer (2.0) version.
oh version 2.0 is upgraded to 2.3 I guess