Both the Gixxer SF 250 and the Dominar 400 are popular bikes in their respective segments, and both have their own strengths. Let's compare them based on the factors you mentioned: refinement, build quality, riding comfort, maintenance, and touring purposes.
Refinement: The Gixxer SF 250 is known for its smooth and refined engine. It features a 249cc single-cylinder, oil-cooled engine that offers good power and torque. The Dominar 400, on the other hand, has a larger 373.3cc single-cylinder, liquid-cooled engine. While it provides more power, it may not be as refined as the Gixxer SF 250.
Build quality: Both bikes are well-built, but the Dominar 400 is known for its robust construction. It features a muscular design with high-quality components. The Gixxer SF 250 also has a solid build, but the Dominar 400 may offer a slightly higher level of durability.
Riding comfort: The Dominar 400 is considered more suitable for long rides and touring due to its relaxed riding position, comfortable seat, and better wind protection from its fairing. The Gixxer SF 250, while still comfortable, has a sportier riding position and may not be as suited for long rides.
Maintenance: Both bikes are from reputable manufacturers and are known for their reliability. However, it's worth noting that the Dominar 400 has a larger engine, which may result in slightly higher maintenance costs compared to the Gixxer SF 250.
Touring purposes: The Dominar 400 is designed with touring in mind. It offers a more comfortable riding position, better wind protection, a larger fuel tank capacity (around 13 liters), and more torque for highway cruising. The Gixxer SF 250, while capable of touring, has a more focused sporty design and may not provide the same level of comfort and touring-specific features as the Dominar 400.
Considering your requirements for refinement, build quality, riding comfort, maintenance, and touring purposes, the Dominar 400 seems to be a better fit. It offers a more relaxed riding position, better wind protection, and is specifically designed for touring. However, if you prefer a more sporty and refined bike with slightly lower maintenance costs, the Gixxer SF 250 could still be a good option. It ultimately depends on your personal preferences and priorities. I would recommend taking test rides of both bikes to get a better feel and make an informed decision based on your riding style and requirements.