To answer your questions (which was done by my fellow BF CRK members above already), it is a personal choice depending upon your taste. I doubt that we would be able to identify performance differences among current raindrop, ladder and basketweave. I would always recommend to buy from shops which are presenting pics of the damascus pattern from the actual knife for sale and not sample pics or pics from previously sold knifes with the same damascus pattern.
When it comes to collectors value the general rule applies: Everything which has been discontinued is now more desirable
The Spirograph blade of above shown TNK Flag Sebenza is not eactly a dealer exclusive, as it will most likely not produced again. At least not with Spirograph. I understood from Neil that this was a last batch of Spirograph, found in stock at CRK and used for this what he calls "closed run". According to him approx 18 small and 25 large were made.
Among the current damascus patterns indeed raindrop is the "most criticised" within CRK community, as the pattern has developed away from the earlier tight pattern. But again, that is all about personal preferences. Basketweave always appears to me and for my eyes more "shiny", "glossy", if you know what I mean. Don't now the reason. I do not think that basketweave receives extra treatment, coating, whatsoever. Maybe it is the pattern itself, which appears like that.
21, CF Inlays, Basket Weave, 03
21, Plain, Basket Weave, 06
21, UG Night Sky, Basket Weave, 03
Spirograph you may have as modern stainless damascus or old non stainless, even colored, like bronze or blue.
Regular, UG Spirograph, 05
Coming back to "collectors value", this is a "dot matrix" damascus, made by Devin Thomas for Chris, in order to propose a new damascus pattern. I think they made just a handful of knives with this damascus and then it was cancelled.
21, Plain Titanium, Dot Matrix, 05