There isnt a straight answer to this.
The fact is you need to take a holistic approach. Is there shading for example - either from the local topography or trees or incorporated into the design, pergolas and so on or decent flexible shutters?
Whats is the internal layout like? Are the living areas and bedroom south or the kitchen and utility room?
How are you going to use the house? Are you a night owl or an early riser?.....sunset or sunrise? How will you use it at different times of the year? Some friends of ours cant use their living room in the summer in the afternoon because the sun comes pounding in. The architect apparently gave no thought to orientation or shading. And its not just their house - its a whole row of 30 odd villas all the same!
Is there any insulation to speak of or high tech windows that might mitigate the extremes of summer or winter?
Is the building airtight?
What are your heating and cooling systems like?
All these factors and more will affect the impact of the sun or otherwise on your property.
Good luck!