Btw, i saw in taobao got 2 sellers VXE and VGN. But former is cheaper and selling only mouse and dongle. Latter is selling mouse and some KB. I guess the VXE is more legit?
It really does not matter.
Spec sheets :
Check preferred switch
Check preferred sensor
Check preferred battery life
Check preferred weight
Check preferred size
Read reviews (can be fake):
Check multiple sources (TB, YouTube, Reddit, your friend beside you)
Check QC issues (can they be fixed easily diy?)
YouTube:
Unboxing
Form factor comparison of mice
Click test
Other things most YouTubers say are just opinions (aka can be nonsense). Take it with a grain of salt.
Physical store:
Test mouse form factor
Test mouse grip
Test mouse weight
Legit sit down and test on a mousepad
Don't buy from store if you like it (unless good price or you need it immediately)
Buy preferred mouse (if available from cheapest source). **** warranty.
Or just checkout straight without doing the above, $20-40 for a mouse can't be bad.