Use a track-focused car instead of a luxury performance car when repeated closed-course driving is the main job and you are prepared for the inspection, consumables, support, and comfort tradeoffs that come with it. Consistent behavior over sessions and suitability for the event matter more than a brief burst of acceleration or a prestigious badge.
The categories overlap. Some luxury performance cars are capable circuit vehicles, and some track-focused cars remain usable on the road. A dedicated competition car is a further step with different rules and practical demands. Choose according to the events you will attend, your experience, and how much everyday road use the same vehicle must provide.