Electrum is more lightweight but it does not offer ♯♯ wallet file security.
This part is not right. Electrum uses AES-256-CBC which is, to my knowledge, a pretty strong way of
encrypting the wallet file for security.I agree with this user.
He is wrong. AES-256-CBC is used in many wallets. So no difference between them. Look at multibit hd beta 0.5 any why it is early. It uses AES-256-CBC and scrypt for key-stretching. Electrum uses SHA256d for key-stretching, same as mining. In this picture you can see brute force attacks with a normal computer. All the wallets use AES-256-CBC. The question is about offline computer. Is encryption important when offline?

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Then what is your explanation for this:
http://docs.electrum.org/en/latest/faq.html#what-encryption-is-used-for-walletsI will add the link to code on GitHub if I can find it since I am bad at python.
Also the picture you have included here is out of context and does not say anything.
What is this result of?
Is it result of brute forcing encrypted wallet files?
How old is this?
How strong or weak was the passwords which were used? (the length of the password for example was it "123" or was it "2Fd#4dlR&jfh8"?
How many tests were performed on how many variations of passwords?