I have neither but I would take the bust over the two.
If space is a big issue though and you want to carry on collecting in the small space you have get the maquette.
I went with the 1/4 scale. The bust looks fine, but I can't enjoy busts because of the overall poor esthetic look having chopped off shoulders and sculpted down dreads.
The maquette has individual dreads, full body detail, and a base. Plus, the exclusive has the helmet.
Spacewise, they both pretty much take up the same amount of space.
I have the reg pf and I have a chance to pick up a brand new P1 bust for almost retail. I'm leaning towards the bust more right now because I can always pick up the CM pred later on