The 1.0L nested inside the 1.6L has been my, two person/ base camp set up for years now - I've never looked to change it. You can even bake bread/ bannock in the smaller, using the larger as an oven. The lid of the 1.6L makes for a better frying pan - at least for bacon and eggs for one (for two - fry the bacon in the 1.6L lid and the eggs in the 1.0L lid)
I would advise anyone to get the two together - and in the event of the zombie apocalypse, I would take these two over my lightweight solo gear! My 1.0L takes an alcohol burner, a small bottle of fuel and stacks of brew kit, and this nests inside the 1.6L, which also contains a flatpack woodburner/ windshield and cleaning kit...
...I could wax lyrical about these pots for hours - they are go to items, but for the sake of boredom avoidance, I'll just say - buy them. You will be happy.