When mine were little and we were working on housebreaking, we noticed Cassie did better with food rewards and Angel did better with verbal praise. Cassie still looks at us weird when we tell her she is good for going in the right place .
Otherwise, she really likes verbal praise, though. Any human attention is good for Cassie. She will do mischievous things to get (negative) attention and then she's immediately submissive and apologetic until you tell her she's good again. Then she's happy .
Angel doesn't really get negative attention, as she doesn't do much wrong. I don't think she gets the concept of doing something to get a reward or a punishment. She lives in Angel World where she gets food and kisses and gets to lick things for hours on end, and life's pretty good .