replacement

Hi all, I need of recommendations for suppliers and battery types to replace the batteries in a standard engine bay set-up in my '98 100 series. Knowledge in this area is limited so not really sure what to look out for. Apologies for the vagueness and thanks in advance.

Toyota sell a replacement part 90915-YZZJ3. I have these, but the original part is supposed to be better, however more expensive. Toyota apparently fits the better one as a factory fit and then advise the cheaper one as the one for a service from the first oil change. I have seen photographs of...