Well.... if during initial sales, more units to choose from, as long as careful, then can get something that matches all the criteria.
inclusive the view (  i got friend which the window over look a shopping mall top, cooling towers and other vents), further from refuse chamber, away from lift etc

if sub-sales... hard to find anything that meet most the criteria. yes, risk lower, but if the unit is ideal- not so easy to reach you.
need to spend lot of time and effort.  And more-ever, if ideal then the price will sure be higher at sub-sale.

well... have to balance ba
not all people got 3 years. may be new baby coming out. or kids going to start school etc.
so not all have the luxury to hunt and wait

Also even sub-sale, we cant rule out all risk.
eg- night mare neighbour, new taman development causing main road congested, etc