I haven't driven or ridden in the Mercedes or Porsche, but the ride on the Plaid is very, very smooth and quiet to me, but my other cars are an X5M and an F-type SVR. It's all relative, but this car is very smooth and quiet to me. Without any engine sound, you hear the wind more, but still overall much quieter than an ICE car. The interior definitely not as nice as the other 2, but with a nice steering wheel and trim, it gets a lot nicer. And there are companies that do custom interiors. And it's definitely much faster than the other 2, but if that's not a priority for you, then probably the Porsche is the best overall option, IMO.