When i started a few years back (not dating myself), i used a weed eater brand string trimmer and push mower. It's all i could afford and i wasn't using them all day 5-6 days a week. As i grew i swapped (bought one at a time) for stihl hand tools. I thought stihl was the end all be all "never using anything but stihl" lol. Then the local mower shop where we buy our equipment lent me an echo string trimmer. It was impressive, easy to load head didnt break line in the head, started first pull, even now we pump the bulb once a day and choke once a day with all my echo equipment. I've since switched all my hand tools except chainsaws to echo. My employees prefer the echos as well, and thats important to me. The echo back pack blowers will out blow our old stihls all day to. Also echo just bought shindiawa this year FYI, not sure what will become of it.
So, for a one man operation i say use what you can afford, and like. As you grow don't be afraid to demo other brands, see what works best for your operation. It's kinda like the chevy or ford argument, use what works best for you.