1. A system for evaluating a plurality of candidate electrostimulation vectors for use in therapeutic stimulation of a heart, the system comprising: a programmable electrostimulator circuit, powered by a battery, configured to deliver electrostimulation to at least one site of the heart using a specified electrostimulation vector; a physiologic sensor circuit configured to sense one or more physiologic signals; a processor circuit, configured to generate at least a cardiac stimulation efficacy indicator and a battery longevity indicator using the one or more physiologic signals, the cardiac stimulation efficacy indicator including a numerical or categorical value indicating a therapeutic effect of the electrostimulation of the heart using the specified electrostimulation vector, the battery longevity indicator including a numerical or categorical value indicating a battery status when the programmable electrostimulator circuit operates according to the specified electrostimulation vector; an electrostimulation vector assessment circuit, included in or communicatively coupled to the processor circuit, configured to: for the plurality of candidate electrostimulation vectors, receive respective cardiac stimulation efficacy indicators and respective battery longevity indicators; and produce a rankable set of at least some of the plurality of candidate electrostimulation vectors using the respective cardiac stimulation efficacy indicators and the respective battery longevity indicators.