As a JKD influenced person, I recognize and utilize the attack on preparation or pre-emptive strike when I feel I can commit to it. However, there are going to be those 'tentative' moments of uncertainty. Then, I'll very likely use a faint and counter, or series of feints, until I see an opening that I can commit to. All I know for sure is that my preference is not to be hit first, nor to be countered...
It's really tough for me to classify myself as one or the other as a 'natural', though, as my response will be dictated by the circumstance. It may not be the right response, but it will nonetheless be dictated by the circumstance.
Come to think of it, my real world experiences all have me striking first when I sensed the danger. Of course, in the spar, I find I'm much more relaxed as the 'danger' level is far lower. The risk of me being killed in the spar is much lower....