Which design is the recommended geometric design for routed topologies?

There is to type of geometric design for routed topologies: triangular ans square (No linear, rectangular or circular). So you know then what is the correct answer.

Fr more details:
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/HA_campus_DG/hacampusdg.html#wp1107902