How to fill these gaps?

[NorthernLights811]

My joiner left a few unfinished gaps in my two bedsides.

Being a bit of a DYIer I asked him what should I fill it in, caulk or silicone, and he said either. I am thinking of silicone because of movement (building's 120 years old). Would that be the right choice?

Another question: material aside, white silicone on top of the shelves, transparent, or brown?

 

[foxhole]

Caulk if you want to paint .

 

[NorthernLights811]

Caulk if you want to paint .

It's white walls and white panels, so I don't think I'd want to paint on top; I'd be fine with the white. Thanks though.

 

[opps]

Silicone is going to be a mare if you plan to repaint in the future. The paint will not adhere to it.

I would go with caulk, but if you want something more flexible, look at a MS Polymer such as CT1.

 

[HERTS P&D]

Use CT1 or BT1, both are over paintable.

Andy