If you could only take one lens

I have a 5D, a 5DII and a 7D for bodies. For lenses I have a 70-200 2.8L, a 24-70 2.8L, a 24-105 4.0L and 16-35 2.8LII. I also have a 20mm 2.8 and a 35mm 1.4L that are boxed up to sell. I have considered taking that 20mm.

The reason I'm taking the old 5D is security, and that's also why i'm considering taking the 20mm instead of the 16-35. Quito can be a little dicey.