Posted By:
Steve M.Richard: I too would love to hear from Frank on this. Of the 11 Ullman cards I personally own (I have a dup McGann) 9 are greenish borders and 2 brownish. Lew's, Ken's and Mike's are all three greeninsh. The lot that sold at Lelands (see link) were all brownish.
I don't think there is much difference in rarity.
http://lelands.com/bid.aspx?lot=1349&auctionid=605