I tend to prefer b2sum (BLAKE2), as it's both fast and (at the time of writing this, AFAIK) secure. There are certainly situations where md5 is good enough, but

I tend to prefer b2sum (BLAKE2), as it's both fast and (at the time of writing this, AFAIK) secure. There are certainly situations where md5 is good enough, but yeah, I feel safer just using blake2 and not having to spend brain cycles thinking whether the hash needs to be cryptographically secure or not, and risk making the wrong judgement.