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Answer to your question - none of the above.  Although I'm not flying yet,
I'm assured that the best a/c battery choice these days is two batteries -
both RG (recombinant gas) and each capable of supplying the basic needs of
an emergency bus - in case of electrical problems - and in combination
supplying your electrical needs for normal operations.

You replace one of these batteries each year - about $75-$100 or you do
frequent testing of the capacity of the batteries and replace them when they
start to tire out.

Source: Bob Nuckolls - http://aeroelectric.com/

LML homepage:   http://www.olsusa.com/Users/Mkaye/maillist.html