Dell Vostro 7590 or Inspirion 7590?

I would like to buy a new notebook. It should have at least 15 inches, an I7, 16GB of memory, at least 500GB SSD and a good graphics card. It should not cost more than 1500 euro. Now I vary between the Dell Inspirion 7590 and the Vostro 7590th The Vostro would be priced, with the same equipment significantly cheaper. The only difference between the two devices seems to be only the case, which is the Inspirion of magnesium and the Vostro made of aluminum, or am I mistaken?

Maybe someone has already made experiences with the Vostro 7590 and can recommend this?

Of both devices there are completely different versions with different hardware, which model with which parts do you mean?