Roc, Lee's package is the better one for creating pretty static dynamic attributes (meaning you set up the attributes at package instantiation time or for quicly creating custom packages), and AMS is better for attributes that can be added by any user at any time (this possibly createing a huge number of attributes). This thread should hopefully explain the differences between the two and give you an update on where they are headed:
https://openacs.org/forums/message-view?message_id=214574
