Here, I made one with more info, feel free to add whichever information you think it's useful to the OP.

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Lower than 4.5: Should update to 4.5~9.2 so you can use emunand. No reason to stay where you are.



4.5 - 9.2: Stay where you are. You can use emunand.



9.3 - 9.5: Only update if you will still have access to homebrew (ninjhax, ironhax, oothax, smashax) or don't mind losing it.

If you update you'll regain access to eShop and gain access to badges, but will lose browserhax, menuhax and custom code. Also it's advisable to stay on the lowest firmware possible, in case of a future kernel exploit.



9.6 - 9.8: Only update if you will still have access to homebrew (ninjhax, ironhax, oothax, smashax) or don't mind losing it.

If you update you'll regain access to eShop and gain access to badges, but will lose browserhax and menuhax. Also it's advisable to stay on the lowest firmware possible, in case of a future kernel exploit.



9.9 - 10.1: Only update if you will still have access to homebrew (ninjhax, ironhax, oothax, smashax) or don't mind losing it.

If you update you'll regain access to eShop and gain access to badges, but will lose browserhax in case you still have it and menuhax. Also it's advisable to stay on the lowest firmware possible, in case of a future kernel exploit.



10.2: If you update you'll gain access to badges and regain access to eShop in case you don't have homebrew, but it's advisable to stay on the lowest firmware possible, in case of a future kernel exploit.

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Please, let me know of any info I might have ignored.

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