I just got a Zoyi ZT-702S and so far it seems to work ok for low frequency applications (automotive, audio). Its build quality is well above average and both the menu and the button operation are quite logical and intuitive - this compared to the other non-brand toy oscilloscopes I have seen in the past. There is a saturation issue in case a high voltage (when compared to the V/div setting) is applied, since the waveform hints to overflow in the ADC codes. I am also missing either an anti-alias filter or a better tuned opamp feedback loop, since sinewaves above 1MHz are showing quite wobbly for me (let alone triangular or square). Perhaps those were corrected with newer firmware (?).
The Zeeweii indeed has better specifications on paper for the same price, but IMO the dual button press interface to execute mundane actions is a deal breaker for me. This was common to other toy oscilloscopes that I saw in the past. I don't know its overall build quality, but the other very similarly looking oscilloscopes I saw in the past were very subpar. Maybe this one is different.