Advantages of having panoramic sunroof - neighbor envy, showing off, when u want to sell off the sportage you can add a premium to the price
Disadvantages: Lets in heat, lets in dust, lets in all the debris including kos polos, rubber seals/beadings can get damaged over time, electric opening mechanism may add to your maintenance cost, can also cause water leakage depending on the quality of rubber they use (will take a few years to see the signs), you will have to make an extra effort to keep it clean.
Verdict - depends on what you are going to use the sportage for.
1. if you plan to have fun with it, go to nuwara eliya often with your head out of the car and run the car to the ground, get the sunroof version (basically if you got too much money and not worried about petrol and resale and all that).
2. if you are planning to make a profit out of the car after 3 years and if your sole aim is that, then get the sunroof but never open it outdoors. if you plan to keep it parked for 3 years with the sole aim of making a buck like many permit people do, yeah sunroof can add a premium (depends on your sales pitch and the car prices at that time).
3. if you plan to use it as a normal car, drive around in colombo and keep it neat and tidy, you are better off without the sunroof