Great Bowden Road to Market Harborough

Coming from the north, when is the best location to get onto Great Bowden road to go into Market Harborough? Do we jump off the A6/Harborough onto Langton/Thorpe Langton/Welham Rd and then onto Bowden? Or, do we take the A6 and get off slightly before Market Harborough at Dingley Rd exit? (I'm looking at Google maps for this information.) Thanks!