https://gamepadla.com/
A very good site for controller latency references
I always use this site that's why I got the Ultimate 2C 2.4GHz Wukong Edition from 8BitDo's official Taobao store for just over S$20.
It has the best stick and button latency, about 5ms for both, and both running at 1000 Hz unlike most other controllers.
The D-Pad is also very accurate and clicky, perfect for fighting games. This makes it two out of four controller I own with an accurate D-Pad. Actually, I sold my other three controllers after getting this one, this is 8bitdo only modern type controller so far, I think they will have a pro version of it.