Is th ere any real advantage in useing the more expensive valve guide seals over the much cheaper rubber umbrella ones.

probably last longer.

None if guides or stems are worn otherwise teflon seals are the go.

Umbrella seals last far longer than ring-type seals. As the guides wear, the umbrellas still keep oil from running down the guides.

Yeah I thought as much. The clever ones are killer dear by comparison.
Once again cheaper wins.