Toyota is a much more reliable vehicle over the Sportage. I work in the car industry and am certified in appraising/evaluating/mechanics of a vehicle. Rav4 is pricier, but is consistently ranked as one of the most reliable vehicles on the market.
Sportage, although not a horrible bet and is better than some of the other small SUV's out there, is no match for Rav4
Rav4 has better reliablity ratings, much higher resale value (Kias have the lowest resale value out there), better safety ratings and better quality options. Sportage may have longer warranty, but with Toyota, you won't have to use much of the warranty, while with Sportage you will.
Overall, the only viable reason to pick Sportage is if you want a very affordable car and if you don't plan to drive it for longer then 5 years and you are not worried about how much it will depreciate once you are done with it. If not, buty a Rav4