2017 340i rwd VS c43 AMG 2018

The bmw is $25,598 with 54,827 miles from a gmc dealer, C43 AMG has 88k miles for $26,190 from Mercedes themselves, although not a CPO. Which one should I buy, the 340i is bone stock as far as options, doesn't have CarPlay or anything. While the benz has options and CarPlay. Will the mercedes have any major or expensive repairs coming up? Someone help me make a decision please. I love the b58 but hate the fact I can't afford a 2020 or newer right now to get the 382 hp...