From my experience and MSc ...
Published by Majed Murad
From my experience and MSc studies SBR as package plant in a ground will be good. Because it collect the sewage and SBR treats in one go. Remember to ensure the diffusers produce fine bubbles. The other advantage of SBR is produce less sludge might reduce certain pathogens. Also you need to remember that existing useful bugs designed to do the treatment has continuous food(sewage) and continuous oxygen. Leaving the house for holiday will reduce food to bugs and impact on their treatment performance.
regards
majed murad
BSc, MSc, CEng, FCIWEM, CEnv.