I think, maybe, you could prefer regular zip for compatibility. But then, 7z is very widespread too,

and it has advantages regular zip lacks, even in '0' aka 'Store Only' mode: larger archives possible, obfuscated encryption possible (password protect a file or dir, encrypt, and don't show what is in the 7z container).

P.S.: If you use Gmail, don't try to send such a secured archive as it won't work. Most types of encrypted files won't get sent, btw. From the viewpoint of Google 'for security reasons'. The gmail user viewpoint could be that Google wants to know what the user sends, or at least let its detection robots loose on certain words within mails or files, mostly for commercial reasons.