Of all the key caps I have tested and used with the VA87M, I feel the SA Industrial is the best keys in terms of feel with the keyboard. This is an old setup and I have long sold both the keyboard and the key set.
This Varmilo VA87M was using an aluminum case off taobao and I really felt the difference between aluminum and the original plastic case. The sound was more pronounced and solid and not hollow like when I was using the plastic case with it.
The board also came with Cherry MX Brown switches with felt really great with the SA industrial set.