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Not only will it be more secure but it will be more efficient and more dynamic. If you stored it in a txt file you would have to iterate through every line until you found the specific user. With a DB it utilizes (generally) a binary search and will, in most cases, find it faster and with less resources.
Beyond that security is huge. Even with storing in a database you should still hash the passwords to protect but your site and your users. I would recommend using the SHA-2 hashing function as things like SHA-1 and MD5 can be cracked.
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