I know that this question has been ask again and again.  I have read a lot of old post on the subject.  Most a dated so I am wondering if you all would mind answering the question again.
I have a 1957 Ford 312 y block, I been told had been rebuilt and have no info of what was done during rebuild.  Appear to be solid and has great compression. Has G heads, 57 intake and Holley 570 cmf carb.  with a stock 1957 Disturber.  Would like to convert to either the Pertronix ll or Accel  if I have them correct. ( confused at which model # applies ) 
My question is.  Is one a better choose then the other? What is needed to go alone with this upgrade?  Any and all input will be gratefully helpful !!!