I like the Vartas, or if you prefer you can get the same battery with a Bosch sticker for another £20. They tend to recommend whatever has the best profit margin and / or marketing tbh.
Ah (amp-hours) is a fairly old measure now and has mostly been superceded by CCA (cold cranking amps), although more is better applies to either. Mildly vexing as Ah did tend to correlate with physical size whereas CCA doesn't, so you have to go on the type code instead (019).
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