status.im is secure?

Is it safe?
Is it safer to send messages?
is better than Session?
Are messages and metadata completely encrypted?

There is no “safe” or “secure” messenger without defining your own threat models and use cases (also see https://www.eff.org/deeplinks/2018/03/why-we-cant-give-you-recommendation and https://infosec-handbook.eu/blog/discussion-secure/#sm).

What do you want to compare in this case?

Messages, see https://status.im/security/ :

All private messages sent in Status are encrypted end-to-end by default.

Metadata: You can’t encrypt all metadata.

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Also check
https://securechatguide.org/p2papps.html#status