I'm fairly inexperienced since I've only had mine a short while... but when the Bernina folks were explaining to me, they suggested starting with 1 since that is what most of us are accustomed to... then with more experience, try to use the 2 method... At first I thought I would never use 2, but I can see that, at least for me, when I'm more accomplished at FMQ with the BSR, I'll probably enjoy the 2nd "gear"...
I think you will really enjoy the BSR!!! I do!!!!