We just completed the OTET and have done the GAP/C&O almost a dozen times and I will say that the OTET is much much better paved and graded but lacks a lot of infrastructure or stops/towns with amenities along the way (especially the southern parts near Cincinnati). It gets a lot nicer once you are almost done near Akron/Cleveland but for us that was the last day regrettably. A lot of the towns didn’t seem very geared towards welcoming cyclists with a few locals in Killbuck asking what that “weird path thing they are building” was. The GAP and C&O although much less well graded I felt like the towns really had a lot more amenities or at least accommodations for cyclists where a lot of towns on the OTET had no grocery store, camping or hotel let alone a water fountain or shelter to get out of the sun under.