Independently adjustable levers - Guntec USA AR-15 Multi Degree Short Throw Ambidextrous Safety

I like this selector because the levers can be set independently of each other. If you have a large diameter handle, it allows you to set trigger side up further in relation to your thumb and curl your trigger finger to flip on your safety. It's an efficient movement and safe. This is the only selector I have found that can do this.