Which is better for pegging Mustang or Slim Jim

I have been shopping for weeks for the best pegging dildo I could find ( I am fairly new to pegging) and I have finally got it down to 2 either the mustang that is Vixskin or Slim Jim that is silicone I just don't know which one. So I put it to ya'll which one is better please elaborate on your answers if possible things I am wondering about are like flexibility, texture, and obviously how it effects the feeling which is really my biggest concern (obviously)