They are designed so that you can mix and match them on your violin to get the balance you need. The tension is the same for either set. The Infeld Red are warmer and darker in tone but not dramatically so. The difference is more subtle than the difference between Pirastro's Obligato and Evah Pirazzi. The original synthetic core string, made with Perlon.
Dominant strings are bright and responsive and are by far the most popular.
When new, Dominant strings have a metallic edge, which fades after a few days of playing. Corelli - Crystal Like the Aricore strings, these strings have a relatively dark, warm sound. Unlike the Aricore strings they do have more edge or punch, which makes them sound a bit brigher and more focused. These premium priced strings have a kevlar core. Their sound has more brilliance than the Corelli Crystal along with a with richness and complexity.