Who is the best left arm spinner of the 3? Vettori has the reputation but never wins matches. Rehman and Herath are quiet underachievers who have contributed to winning matches. In Vettori's defence he plays on less helpful pitches, while Herath gets a lot of assistance at venues like Galle. In terms of talent, from what I have seen I think it's
In terms of achievements, I'm not sure how these 3 would be ranked by the end of their career.