Incessant Nail Chipping

Lately I have noticed that nail polish just will not stay on my nails! Even getting a shellac manicure only lasts one week.

So my questions for you guys are:

Do you guys think it is necessary to use the same brand for base coat, top coat and color? 

Which polish brands do you find last the longest before chipping?

I can't wait to read your responses! Please save me from having to do my nails every other day! 

Enjoy & Be Beautiful!