What's the best Android version for Xperia Z?

[tokafondo]

Hi all. Now I bought a Xperia Z C6603, tired of my Galaxy S3 GT-i9300.

It's branded and customized by Orange operator, and it's currently running 4.4.4.

I want to debrand the debloat the phone, but I'm wondering about the benefits of upgrading to newer Android versions.

Do the phone get faster? Slower? Do the battery last longer? Or shorter?

I'd appreciate your comments.

Thanks all.

 

[Zerikwan]

the latest official ROM of Z is Lollipop 5.1.1 .222 or .228 firmware version (in my country is .222) wich in my opinion is the fastest official ROM but not a battery friendly.

If you wanna go higher, just root, unlock your bootloader, install latest TWRP and flash LOS 7.1.2. This ROM is nice.

Don't forget to backup your TA partition before unlocking.