To start with, Turbo is obviously better. But if you want to buy one for yourself, there are multiple aspects which you need to consider:
Things that go for Oriel:
1. The Price: Some people just can't cross the 3 million mark for a car. Hence favoring Oriel.
2. Running Cost: You will need High Octane most of the time with the Turbo as the turbo behaves well with the HOBC. Hence favoring Oriel.
3. Practicality: As one require premium fuel for the turbo, you will always find it hard to get quality fuel in non urban areas. Hence turbo is non practical if you travel a lot. Hence favoring Oriel.
Things that go for Turbo:
1. Extra Horsepower and Torque: You will get more acceleration and speed. Even if you drive slow, the excess acceleration can be beneficial while over taking. Hence favoring Turbo.
2. Lower Tax: As Turbo has 1500CC engine, annual token tax will be less. Not that significant but still favoring Turbo.
Conclusion:
I have booked an Oriel for my self because of the reasons that I have mentioned above- practicality over extra horses. Though I would love the extra power of the Turbo, yet at the same time, the non turbo version isn't that bad either. Its still faster than most of the cars on the road.