Well i guess outta the 3 options that u've listed the Skoda Laura Elegance 1.9 TDI wins hands down. The car offers awesomely plush interiors and is loaded with a host of other luxury features like the sunroof, automatic climate control, rain sensing wipers, leather upholstery, cruise control, parking sensors, tyre pressure monitor, 6-CD changer & more. The other 2 options that you've lisyed don't even come close as per say. But then again all this comes at a price. While the top variant of the Optra Magnum ie LT would be priced somewhere between 10-11 lakhs, the Laura Elegance would make you shell out close to about 14.5 - 15 lakhs. (Even the Laura Ambiente is between 12.5 - 13 lakhs with a cut down in features as compared to the Elegance model)
But if you look at the technical specifications the Magnum definitely has an edge over the Laura. Its powered by a 2.0L 121bhp diesel motor compared to the 1.9L 105bhp one in the Skoda. Its just such a pleasure to drive and if you are not such an avid fan of all those additional features in your car then this car is a great value for money deal any day!