KMA 80 R vs KM91R for Rotary Scissors/Blower

Hello. I plan to purchase a Kombisystem head to use for lawn care at my home. My yard is not particularly large. I plan to mostly use the system with the blower and rotary scissor attachments and potentially the string trimmer.

Any recommendations on which power head would be best? I like the ease/convenience of battery operated, but am willing to go with the gas unit if it offers noticeably better performance for my situation. Thanks!