Light & Motion Stella-N versus Dinotte 200L?

I need to make a decision between these two lights. Will be used helmet mount and will be my only light. I have seen the stella in person, but how does the Dinotte (spot or wide) compare? I felt the Stella had a nice center with good side light just wondering how the dinotte compares. I liked the helmet mount on the stella, how does the o-ring thing work for the dinotte?