should i replace two or all four tires?

I would STRONGLY recommend to have the exact same brand and model tires front and rear.
Last year I replaced the rears on my RWD Stinger and chose a pair of Nokian Powerproof. The original fronts were Continentals ContiSport 5. They are both UHP tires and the price and reviews were similar.

I was forced to also replace my fronts immediately after (with nokians) because the car behaved like a mad beast. The turn-in was instant but then somehow the rear would not stick and it felt like it was oversteering. When the rears finally did stick it felt like the car was understeering.
It was fractions of a second but really really bad experience, especially at high speed.
 
Kia Stinger
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