Switzerland is known for producing high-quality and technologically advanced CNC machines, and many of them are well-known and widely used in various industries worldwide. However, the best-selling Swiss CNC machines can vary depending on the specific application, industry, and region. Here are some popular and widely used Swiss CNC machine brands and models:

1. Tornos CNC machines – Tornos is a leading Swiss brand in the CNC machine industry, known for their high precision, efficiency, and versatility. They offer a wide range of models for different applications and industries, such as turning centers, milling machines, and multifunction machines.
2. Studer CNC machines – Studer is another well-known Swiss brand in the CNC machine industry, known for their high precision and reliability. They offer a wide range of models for different applications and industries, such as grinding machines and cylindrical grinders.
3. Mikron CNC machines – Mikron is a well-known Swiss brand in the CNC machine industry, known for their high precision and productivity. They offer a wide range of models for different applications and industries, such as machining centers, milling machines, and high-speed milling machines.
4. Star CNC machines – Star is a well-known Swiss brand in the CNC machine industry, known for their high precision, efficiency, and versatility. They offer a wide range of models for different applications and industries, such as turning centers and swiss-type lathes.
5. Schaublin CNC machines – Schaublin is a well-known Swiss brand in the CNC machine industry, known for their high precision and flexibility. They offer a wide range of models for different applications and industries, such as turning centers and milling machines.

It’s worth noting that the best-selling Swiss CNC machines also depend on the region, some brands might be more popular in one region than another.