Don't forget cranking power (CCA in Amps) and capacity (in Amp-hours) are not the same thing.
Unless you need a high reserve of capacity for "hotel" or "off-key" applications (unlikely in these days of efficient circuitry), go for CCA.
(I have spent, or wasted, over 40 years in the battery industry attempting to educate my colleagues in Sales and Marketing about the difference between power and energy..........)
