I like all 3/4 modes in general, and usually like gerwalk mode the most - it not just another fighter or another robot, the most uniquely "Macross" mode. For a toy display without stand, G modes are usually safer from falling than B mode, and a bit easier to squeeze for shelf space than fighter mode.
A few units are kind of bad at gerwalk modes: YF-21 is just ugly in that mode. Yamato VF-19 have wings restricting the arms, and limited ball joint range of the foots. Bandai VF-25 are even more restrictive with arms if the super or armor packs are on.