Best uses of Shadow spells?

[Rycaut]

In a recent PFS scenario I ran there was a wizard who had Shadow evocation and Shadow Conjuration prepared. Due to running the combat via the given tactics I didn't actually cast either spell but had I chosen to do so I'm curious what spells people favor?

The stat block suggested Fireball, Sleet storm or resilient sphere but it seems to me there must be better options.

[Azten]

Here on Paizo two guides, one for each spell, were made.

Shadow Evocation
Shadow Conjuration

I love the idea of using Evocation to make walls you can then walk across by voluntarily failing your Will save.