New England has the most beautiful fall foliage in the world. That’s not an opinion — it’s a fact. Which roadway in the region is best for leaf-peeping is another matter, but the Kancamagus Highway and the Mohawk Trail are top candidates. The Kanc stretches 34.5 miles west to east from Lincoln to Conway, N.H., while the mountainous portion of the Mohawk Trail covers about 36.5 miles east to west from the Greenfield to North Adams. Here’s how the two drives stack up.—By Patricia Harris and David Lyon, Globe Correspondents