Outline_Compare and contrast

Obviously, People nowadays go to large supermarket stores instead of grocery stores for their daily life musts. It is true that the supermarket prevails in many ways; nevertheless, the traditional stores have their own benefits, too.
1. The prices:
small grocery stores: a) more cheaper
b) usually inflexible
large supermarket stores:
a) sometimes cheaper
b) get lower while some specific holidays
2. The service:
small grocery stores: a) have shortage of staffs
b) poor resources of information
c) the clerks are often kind
large supermarket stores:
a) more employees
b) sound information offering
c) the attitude of the workers are friendly
3. The food:
small grocery stores: a) things are easily overdue
b) the selection is quite limited
c) will give some extra offering
d) the refund system is not rigid
large supermarket stores:
a) foods are often fresh
b) plenty of sorts to choose
c) the surrounds are more tidy
d) serious refund system