Boar on the Floor
They're both good... sorry, I know that doesn't help. I havent spent enough time with Quadra to endorse it strongly, but I definitely like what I hear so far. I've had Mallet Flux for a much longer time and have actually used it in scoring projects, so I know it can deliver the goods.Mallet Flux is on sale for $99.50
I think I'd prefer Quadra.
Thoughts on the 2?
One significant difference between them is that Mallet Flux is just pure tonal percussion instruments, while Quadra has a much broader sonic palette that includes synths and other percussion. So that might be enough of a reason to go with Quadra.
They're both capable instruments. It really depends on the sound you're after.