I have the A-chain and Flexi Felix and white both are good, there is one aspect in the Ophoria beads that I prefer over the Fun Factory one. Flexi is more flexible and when you pull it out, you may get an elastic effect after releasing the last beads. Great set but it can get extra messy. The Ophoria is not that elastic and smaller in circumference than Flexi, and may begin to be "too small" rather quickly. The thing I like best about the Flexi is that I can easily leave it in during partner sex and he'll feel it well as it tends to bunch up together.
But don't be fooled by Felix's flexibility, the silicone is sturdy and it's nothing to worry about.
Both great for beginners.