The GW-Instek isn't competitive with the Rigol on features or build quality.
Repeating a false assumption doesn't make it right. If what you wrote where true then why would I have bought a GW Instek?
No idea.
After all I'm Dutch and Dutch people don't spend money unless there is a really good reason to do so.
I'm not saying it's rubbish, I'm just saying it's got half the bandwidth, it's mostly not competitive on features (see below) and build quality is worse (Dave's conclusion, not mine - see his teardown video).
The GW-Instek
does have a couple of strong points: eg., If FFTs are very important to you then it may be a better choice. The Rigol's FFT function isn't as good.
It also has a proper push button to make a menu selection instead of using a twisty knob. Is that worth more than double-bandwidth? It's up to you...
PS: It's not me "Repeating a false assumptions", it was the GW-Instek fanboys that started it. As usual.
(this time they started with a repeat of the 'Yaigol' PLL nonsense - which has never been shown to have any adverse effect on anything)