take a look at
https://www.tayna.co.uk/, i have used them before and they are competitive.
Personally i would stick with the same battery type, so just take a look at what is currently fitted and go from there. saves any issues (if any) that may occur over time with different charging/etc
I checked my V60 and that clearly states a EFB, and is a clearly labelled Volvo battery so 100% certain that is original and the type, so check yours. Tanya does say AGM for mine also, but they cannot be 100% correct all the time.
also EFB is cheaper i think.