If itエs only for occasional use I would rent one. But if you wonna use it more often, I would buy a tiller.
Iエm not sure, what to recommend. I never have worked with the rear tine tillers which are offered in USA and the front tine are ok so far, if it comes to prepared soil.
The prob by the for me by the rear tine is, that they are not multifunctional and also a front tine should be. Fortake is, that they are awfully cheap in USA compared to Germany, if it comes to a quality product with B&S, Honda or Kawasaki engine.