Dennis, I believe the SD1 one touch is actually a favorite sound group..To select your right hand sounds..

The G70's OTS is like 4 individual user groups within the style..It will save all panel settings for immediate changes..that is 4 completely individual OTS...This will allow any or all of the 6 layers[tones]..splits, effects, and controls for each One touch setting..

It can be very elite....

Let me recap how the G70[and E80] work..
You can select a saved User program that has all the panel settings and Style selection, also how the style will start and what intro, etc..This is the starting point..There within, are the 4 OTS, with addition settings, allowing for live changes, during performances..