A couple of additional points (and thanks for the private message on Facebook yesterday).
You say you haven't decided which way you'll be going west and which way you'll be returning. Wait as late as possible to decide that, and definitely check the weather forecasts (remembering what I said about weather possibly being a factor on I-68). If you're guaranteed a nice day on the trip west, take I-68 then, so there won't be any problems if it turns bad for your return trip home.
After seeing one of the suggestions made above about an alternate route, I came up with two alternatives that are both much more scenic than following I-70 and I-71.
Coming west, follow I-68 to Morgantown, but take I-79 only as far as Clarksburg. Then pick up US 50 (Corridor D) and OH 32 through Parkersburg to Cincinnati. There isn't a lot between I-79 and I-77, but it's a rural area and lightly-traveled, with a 65 mph speed limit. You'll get to see the new Blennerhassett Bridge crossing the Ohio River. Services will be spotty through Ohio but you'll find gas, food, etc., often enough. Once to Cincinnati, take I-275 into Kentucky to link up with I-71.
On the return trip, I-64 to I-77 to I-79, but exit at Exit 99 for Weston and take Corridor H (US 48) over to I-81. You will still find two two-lane segments, from Kerens to Davis/Thomas, and Wardensville into Virginia and I-81, but it's a pretty drive, and honestly, I don't find those two-lane portions to be all that bad. To me, the worst part is the end of the four-lane at Kerens to Parsons. Services will be sparse beyond Buckhannon. Most everything at Elkins is on the other side of town. Parsons has a McDonald's, but the Sheetz there closed last year. There's a Sheetz right off US 48 at Moorefield. Wardensville is a 25 mph speed trap. This route puts you on I-81 at Strasburg, just south of I-66.
If I was traveling to that area, I would choose either of these alternatives over going through Columbus on I-70 and I-71.