Whichever is less, based on Wally jug price that would be Valvoline Premium (VWB). ~5k/6month oci is no problem for VWB and your driving profile.
Durablend is rare item, not sold at Wally in these parts. If I had to have a Syn Blend in 5w20, I'd go with Motorcraft for availabililty and price, just me. But again, VWB is just fine.