SHA1 or MD5 for web applications

A lot of people have recently started using SHA1 over MD5. I 开发者_Python百科know that MD5 has it's security flaws but what other reasons is making SHA1 becoming more popular lately?

SHA1 is also looking weak now. For new applications you might as well start with SHA-256.

Lower chance of collisions mostly. It's better in almost every way except backwards compatibility.