"Trowels" or "Floats" for Rendering and Concreting?...

Dear Sirs, Well, I just bought myself a little Cement Mixer this afternoon, and I am now gearing up with the necessary handtools to allow me to make a mess of some long overdue Rendering and Concreting around the place...:- After I screed off level with both the Rendering and the Concreting, I'm wondering what would be the best tool to hit the Render/Concrete with - a flat steel Trowel, or a steel Float with slightly upturned edges? Here's a link to a page at the MasterFinish...

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