I owned a Gen 1 Shield. Hell, I've owned 4 of them. The trigger was "okay."..
I've owned one Shield 2.0 Trigger. But, it was a performance center model. It was a little better. I shot the gun a bit better than the gen 1 trigger. But, as it was a PC version, they did a little extra work on the trigger. I don't know how a standard 2.0 trigger feels on the Shield.
However - the Shield Plus trigger is way, way, way better than any other version of the gun. I have three Shield Plus pistols now. I also sold my older Shields once I discovered the Shield Plus. That tiny bit extra width in the grip made a huge difference to me. I always thought the single stack Shield was TOO thin. I knew that once I got the Shield Plus models, the older Shields would just be sitting in my safe forever.