I am looking into buying a noise reduction pedal and wanted to know what the difference is between these 2. I read the description of both but have to admit I don’t really get it. So can anyone please explain in terms I can understand what is the real difference between these two?
the g-string is '2 channel' so you can run it in BOTH your effects loop to kill amp noise...and in your signal path to kill guitar, pedal, cable noise....

the regular one is '1 channel' so you can only run it in one of those places
you can put the G string through the effects loop and front of the amp. Better deal imo
LTD JD 600
Fender Celtic Esquire
Ibanez RGA7
Schecter S-1 Elite
Line 6 FM4
KORG Pitchblack
Digitech Whammy
Dunlop Wah
Ibanez TS-9
ISP Decimator
Peavey 6505 Halfstack
Marshall 1960b Cab
Line 6 POD X3 Live
Also the G-String has the tighter gating of the Pro Rack G model.

If you are picking between the two, the G-String is by far the better purchase.