BROWN HASH

which hash function out of md5, sha1, crc 32 is the best in terms of minimum collisions?

i am interested in uniquely identifying files using hash functions and i would like to use that hash function which produces hashes that have minimum collisions and thus are most reliable in terms of uniquely identifying very large number of files

SHA1 collision rate is roughly 2^80, CRC64 is roughly 2^63 (not sure about CRC32), and MD5 is 2^64.