First i want to correct the question, i hope it is the difference between fasta and Annotated sequence instead of fasta and attonated sequence.

Both fasta and annotated sequences are different formats of same sequence. You can refer it from the following links:

Fasta format:

http://www.ncbi.nlm.nih.gov/nuccore/327323284?report=fasta

Genbank format:

http://www.ncbi.nlm.nih.gov/nuccore/HQ874461.1

The main difference between two formats are that fasta is simple format whereas annotated sequence formats have more details or information about sequences. Genbank is one of such annotated sequence formats.