I went from a 151 to a 162 and never regretted it. Its almost all what your used to and as long as you aren't a half-pint you will move the 162 around just as well.
in your decision, I would decide based on which sled is nicer, has more extras, less miles etc FIRST, and then which track you want. the 162 will get you farther but in most situations you will get everywhere with the 153. Realize it is only 3extra paddles on the ground. There is an advantage but for the average rider not night and day, life and death, i think you get the picture.
just my .02.