More of my main cubes are from MoYu than GAN. Neither one is bad, but they have different strengths.
MoYu: Cheaper, more controllable cubes, & a wider variety of puzzle releases
GAN: Lighter, faster, and more durable cubes, with more adjustability
Along with that, they also fit different turning styles. MoYu's cubes are better for more stable & controlled turning, while GAN's cubes are better for faster & more effortless turning. Though people often say that GAN cubes are too fast for them, so they use MoYu cubes instead. Sometimes I feel that way too, but other times I really enjoy GAN cubes and their effortless turning.