why upgrade from catalina to big sur

I want to install Xcode .most version of Xcode is not supporting .it shows need 11 version

brerpossum wrote:

Running Catalina 10.15.7 on my MacBook Pro late 2013. Is there a burning need to upgrade to Big Sur?

Of course this is 'dealers choice'....however

I would turn the question around and ask you— is there a compelling reason not to keep your Mac up to date?

Upgrading macOS without fear - Apple Community

It is always recommended to keep your software up to date, if for no other reason the security updates associated w/ the lastest macOS...and the XProtect, the anti-malware system on the macOS.

Apple uses its Software Update service — as a mechanism for installing “background and critical” updates that are installed silently in the background with no notifications to the user.

macOS - Security - Apple https://www.apple.com/macos/security/

Apple Platform Security - Apple https://support.apple.com/guide/security/welcome/web

It never pays to fall too far behind in the hardwardware or software—this only makes the risk of a not so clean migration, when you are forced to make a leap. Baby steps along the way compared to a giant leap. This insures your associated software stays compatible and you are not overwhelmed when the wheels fall off.

How to Download an Older Version of Xcode - Apple Developer

brerpossum Said:

"why upgrade from catalina to big sur: Running Catalina 10.15.7 on my MacBook Pro late 2013. Is there a burning need to upgrade to Big Sur?"

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Upgrading to a macOS:

It's preferential - your call. But as new technology comes out, newer macOS versions are developed for compatibility and safe usage.

What sealed it for me was Dark Mode. My keys would get stressed looking at the bright white of documents, etc., all day long. The dark mode gives me black background with white text, much easier on the eyes. I also think it's faster but that can be subjective.