I'd favour the Toyota out of your 2 choices, but the reason has nothing to do with price, running costs or reliability. To me it would boil down to driveability.

The Kia has 98bhp, the Toyota has 114bhp. That may not seem like a big difference, but the Kia has a n/a 1.4 while the Toyota has a turbocharged 1.2, so the important figure, given these are both estates, is torque, and at what engine speed it is produced. Here the difference is much bigger, with the kia mustering 147nm @ 4200rpm compared to the Toyota's 185nm from 1500-4000rpm.

Even if you are not a fast driver, i suspect the Kia would very quickly become frustrating and tiresome to drive, constantly thrashing it just to keep up. And because you could drive the Toyota much more gently for the equivalent performance, the economy is likely to be much better.

For this reason, it would be the Toyota, no contest.

How convenient to you are the respective dealers & what sort of reputation do they have?

You don't have to have the car serviced by a dealer to maintain the warranty but it will have to have been serviced according to the manufacturer's schedule & with parts of equal or better spec. & have all the paperwork to prove that should you require to call on the warranty.

The Toyota warranty can be extended for reasonable amounts (especially if they have a 2 years for the price of 1 offer on) if you are that way inclined & includes Toyota Roadside Assistance (provided currently by the AA).

At 5 years old the Toyota will become eligible for Toyota Essential Care servicing which is quite competitive & is designed to keep older cars serviced in the dealer network.