Stock (OEM) plugs because a Cherokee is not a performance vehicle and its engine runs fine and forever with OEM plugs. Performance plugs are designed to address problems that a slow-running, relatively low compression Cherokee engine doesn't have. But if the money to buy performance plugs is burning a hole in your pocket, go for it. It's like buying premium gas - it doesn't help but it doesn't hurt either.
Stock (OEM) plugs because a Cherokee is not a performance vehicle and its engine runs fine and forever with OEM plugs. Performance plugs are designed to address problems that a slow-running, relatively low compression Cherokee engine doesn't have.