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+1 for measuring and calculating what you need at each voltage.
I bought myself a large-ish (576Wh) Li-Ion power pack not just for less weight and compact dimensions but also because it was comparable in cost and durability. At my frequency of usage, it ought to last 15 years or so ... probably longer than me. I did buy it on sale, though.
The Li-Ion battery itself may be significantly more expensive per Wh, but the conversion equipment you typically need (for a full AP setup) adds further to cost, space, weight and cables.
My Li-Ion pack has 2 x 240VAC, 3 x 12V, 2 x 5V, a built in solar-charger (just add panels), 240V rapid charger, 12-16V charger and all the control and monitoring electronics, including WiFi to be (optionally) controlled remotely. And I've used all of that except the solar charger, so far.
The cost of a lead acid battery of similar usable capacity and all the controllers, chargers, adapters and cables is about the same as the Li-Ion pack (or at least it was when I did the costing).
It also comes in handy during power outages: e.g. during an outage a few months ago, it ran my fridge for 8 hours with power to spare.
Your circumstances may be different - especially since you just seem to want to drive a single modest mount - but it added up for me.
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