The other route says I-81 for 68 miles to enter Maryland, then it's I-70 for 25 miles, I-68 for 111 miles to enter W. VA, then I-79 90 miles, US-19 for 67 miles, then I-77 for 67 miles to enter VA and back to I-81 148 miles to enter TN.
ALL of this, just to end up back on I-81 :h
I-70....nothing but traffic fleeing Balt & D.C., You'll get enough of that on I-81 as people head home. No one really lives in the cities, they all commute from western MD, VA & WV.
I-68...you better like hills. Lost of long, long, long pulls. Many have towns at the bottom of the hill (lower speed limit and "S" turns) making RUNNING FOR THE HILL nearly impossible.
I-79... more hills and built in a way that winds through the mountains. Read as twisty road.
Rt 19... DO NOT SPEED in Summersville. They are famous for speeding tickets. They especially like trucks and out-of-towner's using rt-19 as a short cut from I-79 to I-77.
NOW you get to PAY A TOLL to ride on a portion of I-77 that has been claimed by the WV T/P.
What did you get for your effort. More traffic on a hillier, twisted roadway, that you had to pay to drive on??????? SIGHTS....none, these roads twist thru the mountians with nothing to look at or stop for...swing thru a town...back out in to nothing-ness.
PLUS....I am not a geographical guy, but I am pretty sure that I-81 runs along a valley (a bit up and down) whereas 68 will have you cross over a mountain, only to cross back on 79.
I would stay on I-81 unless you like driving and putting wear and tear on your drivetrain for no reason.