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I don't get why Juniper and Cisco trie-lookup forwarding would differ in comparing IPv4 and IPv6; Juniper does a 8+1+1+1+1+... search until a leaf node is found, while Cisco does 16+8+8 (or something near it but still with 3 phases); for both architetures, IPv6 longer addresses implies walking more deeply into the tree in order to find where to route.

ahhh. you have been watching marketing architecture presentations.

Usually it's a good way to learn about the architecture of the competitor's(i.e, not the company of the presenter) router; watch both of them and you get a pretty good image of what they are.

otoh, we have been using real routers.

Those real routers have real architetures with what behaviour regarding prefix-length ? Rubens