I would play the G7 over ANYthing made by General Music to date. (never saw the Genisis .... to be fair)
It's a solid, powerful piece, but the styles are basic, and dated. The sounds are above average in the rhythic voices and about average in the solo sections. It has 4 DSP's (crappy)vocal harmony, and a great sound system with audio inputs.
Entire style bank can be replaced with user styles. Multitask Floppy drive - NEVER glitched on me - lyric readout - fill in's for each of 4 variations just like the psr2k.
Only trouble is - NO 3rd party support for styles.