Cheap black hen capes are good, expensive genetic one are bad for spiders. A lot of modern hen capes have fibres that are too dense and stiff, the Keogh ones that Orvis supply are not bad as are most of the Indian capes but these can be quite hard to find an you really want to see a cape first before you buy it. Starling is good as is Magpie scalp, I tend to use the latter.
Cheers
Ben