Unless you are willing to reconfigure all of your loads to operate on 24 or 48V, then you might as well stay with the 12v system voltage. The efficiency of a 24V or 48V 1400W inverter is likely better than a 12V one. OTOH, your lighting loads operate directly off 12V; so if you switched to 24 or 48V, you would have to run them on a switching step-down converter, which would offset any gain in efficiency on the big inverter.
As long as the batteries to be charged are wired in parallel for 12V, then your wind charger would need to deliver about 14.5V to charge the batteries. Look at specs for charge-controllers. It is possible that a switch-mode charge controller is more efficient starting from 24V or 48V even when charging a 12V battery. In other words, the answer to your question is likely determined by the selection of the charge controller.