A1, A14, M11, M25 every time, they've built flyovers to most of the roundabouts which were holdups such as Markham Moor, Stamford, Colsterworth etc, runs straight into M11. I do it on a regular basis on a Friday rushour. Also if the proverbial does hit the fan, there are more options to get off the A1 and take to the country lanes rather than queueing for a junction that may be 15 miles away.