It should really be about what YOU want, as long as your choices are reasonable for your skill level, and you've got two excellent choices there for someone with little to no flying experience. They're so similar in design, size, weight, and power...

There's no such thing as an "RTF" Slow Stick unless you pay someone to build it for you, or buy it used at a swap meet. The Slow Stick comes in kit/ARF form only. If you want to be able to take it out of the box and fly with a minimum of assembly, you want the Slo-V.