Depends on the collectible and price-point. I love statues that have artistic significance and merit (which are both entirely subjective things), typically not pop culture-related ones. So these are my two favourite statues currently:
Gummy Keiko by Fools Paradise—beautiful sculpt and I like the symbolism of seeing through the familiar gummy shell into the woman inside, wearing the bear parts as a costume
Omen Fade Ignited by Coarse—produced in memory of Roman Shevchenko, a collector (and brilliant toy photographer) who died in 2014
My figures fit broadly into two categories—toys I like to play with, and artistic figures that I will set up and leave, essentially statues with an underlying poseable body. The 1000Toys Synthetic Human falls into the 'toy' category for me, even though the price-point is high:
Hot Toys' Iron Man figures are the same for me—even though many people prefer museum poses, I like to play with mine. On the other hand, one of my favourite figures is ThreeA's Dead Cosmonaut Golovorez, which has no exposed joints, a killer sculpt and a bulky cloth spacesuit. In terms of its function in my collection, it's a lightweight mixed-media statue:
Some of my favourite pieces fall into that camp, because they're stunning to look at and have no exposed joints, but can be convincingly displayed in many poses. Look up Kenny Wong's Copperhead-18 'Dig' figure for another example.