Hi,
I would prefer PSR 2000 because the styles are with 4 variations (G 600 only 2, the other "varaitions" are generated by muting of some tracks).
G 600 isn't easy to use (small display, to much sub menus) and contains no long sample voices, like "Sweet flute")
When you want the G 600 voices, look for a Roland tone generator (JV, XV or a second hand sound canvas SC 88 pro, sounds like G 1000).

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Regards
RF