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7-Zip question on developer, download and comparability-performance

We are reviewing our compression tools in order to finally replace it for a better one; our main concern is the encryption used.

We have been recommended in various occasion the open source product 7-zip over commercial products.

We use WinZip 9.0 and WinRar 4.20; we know they are old, so now we are considering 7-zip product.  However, some question regarding this product in order to decide to make the change and wanted EE experience on the following:

Is there more than one provider or developer of 7-Zip?
Which is a reliable source for download 7-Zip?
Being an open-source is it more vulnerable than commercial version?

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8/22/2022 - Mon