Is it faster to check if length = 0 than to compare it to an empty string?

I've heard that in some programming languages it is faster to check if the length of a string is 0, than to check if the content is "". Is this also true for T-SQL?

Sample:

SELECT user_id FROM users WHERE LEN(user_email) = 0

vs.

SELECT user_id FROM users WHERE user_email = ''