I've heard of the invicta variety, but never tried them. My guess is that it's not as sweet. The description sounds good, a very large fruit.
Here's the description for Tixia:
Zones 3-7-(PPAF) Jumbo bright red fruits on nearly thornless canes. Developed in Switzerland where gooseberries are favorites, Tixia allows for painless picking as its one year canes have few thorns, and those that remain are relatively soft. Huge, elongated, smooth red fruits with succulent 'sweet-tart' flavor are delicious fresh and also make mouth- watering pies, jams and jellies. Fruit ripens in July. Strong, upright, high-yielding plants are mildew resistant.