hi
why we are asked to use the interlock or Vardon grip is to get the hand together so they act as one and not independantly like in the baseball grip.
most of us are right handed and play where we need more control with our left hand and not our right, in the interlock we take a stronge finger off the right hand and put it inbetween a weak finger of the left and this helps to ballance the hands and weakens the right and adds strength to the left.
in hogans book he talks a lot about balanced hands and being the fundmentals of a good swing. if a baseball grip works for you then stick to it but i feel better to go with a interlocking grip.
the best grip would be for all the fingers to interlock and both thumbs pointing down the shaft like some player do now with there putter and the big fat grips the are as thick as a beer bottle like they use now.
bill