Which do you believe is better any why? They are in no particular order.

1. Eerie Devil's Hank by Sandra Sisti through Richard Osterlind
2. Devil’s Hank Pocket Square by Lynetta Fabric Manipulations
3. Devil’s Pocket Hank by Lynetta Fabric Manipulations
4. Double Devil by Lee Alex

I will be using mine for both Osterlind's Crystal Ball routine and forcing billets.

For the Crystal Ball I would need black, but the ones listed above either come in black or could be custom ordered to be black.

The most organic and not magicy looking is also a plus.

Double Devil has the advantage of being well "double" as well.

-Alex

I haven't used the first three on your list , so I can't give you a comparison ,but I will tell you that I have two Devil's Hanks by Lee Alex and am very pleased with both. Lee has a number of designs available.

Although if you're specifically getting it to use with the Osterland routine , maybe it makes sense to use the one he sells?

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I have had lot of good comments on my Devils Hank used by Eugene Berger and Jeff McBride. Yes, I make them in black which is kind of a brocade which helps hides the bulk more.