AGM is better than EFB, according to the battery shop.
According to the shop, he was surprised that my skoda superb use EFB.
His guide said to use AGM.

Yours has 2 yrs extended from dealer.
So you won't get support if you call skoda assist. You need to go back to the dealer. Then you need to find out if battery is part of their warranty.

If I'm not mistaken or misheard, Delkor EFB $299 battery 660-680cca, install and program.
Varta AGM E39 $488 750cca.
From the battery shop quote.
Hope it helps.