I prefer the old-school collar and sleeve from guard.
From side top, knee on, the back, and bottom positions, I mostly stick with no-gi gripping options.
What kind of cool stuff do you like to do with grips from these positions? Got any neat tricks?
from guard i like either collar and sleeve like you said or cross grip on sleeve and knee pant leg/ankle control.
from top side i like wrapping the gi under the armpit with my arm under the head and close knee pant leg grip.
from knee on i like to get my thumb in the collar behind the head and far side hip check with my other hand or the same as my side mount if available.
mount one hand in collar or arm behind head depending if i need to be up or down.
rest is pretty much no gi grips.