Advance auditing service covers one google adwords campaign with 5 adgroups. Maximum 6 hours are spent on analyzing, keywords research, landing pages, and so forth.
If your adwords or facebook campaign is very basic or you are just starting out, this package would suit your business.
Premium SEM auditing covers 2 google campaigns with 25 adgroups. One of our adwords certified specialists will look deep into your campaigns and will recommend insights and improvement for your campaigns.