I need to download a dataset of proteins secreted in exosomes, the bigger the better. My first idea was to download data from UniProtKB but then I discovered ExoCarta (http://www.exocarta.org/), a DB focused on molecules secreted in exosomes. Both UniProtKB and ExoCarta are curated, being ExoCarta manually curated. ExoCarta provides me with 9,000 proteins, whilst UniProtKB has 7,500 approximately.
Then, the question is: which DB is better to work with? Which source is more reliable? I would very much appreciate if someone with experience in the field answered me.