Black tank stuff

My RV is approx 40' from nearest sewer cleanout. If I redo my driveway i may consider trenching a line for a cleanout to attach to my sewer for easy dump but that is not happening soon. My question is...if using a macro jet type cleanout system with a garden hose....is it as good as a 3" dump valve into a 3" Sewer? In other words, for drawing the solids with head pressure into a 3" cleanout vs opening a 3" valve to a garden hose garbage disposal to spit the waste through a garden hose to a cleanout.....which is the better cleanup for the black tank itself? Does the "jet" vacume anything or is head pressure best for removing the larger solids?