Lathrop and Sons insoles do not offer any support - they rely on the boot to offer the support. If you look at them on a table top or the ground, they are a completely flat piece of silicone cushioning. For me, they work well when used in the L&S boots (fit like a glove), but I don't use them in other boots. My personal feeling is that L&S designed the last of their boots and their insole to work together to provide appropriate support, but that won't be the case in other boots.
Sheep feet are a real custom orthotic - designed for your foot, built in support.
Given the choice, I'd use the latter. I have a set on the way, paid with my FSA, and will test them out this year in both my L&S boots and my Crispi's.
The wild card for me (will need to let you know) - is what I prefer using my L&S boots vs. my Crispi. There's a chance I will continue to use my L&S with the L&S insert, there's a chance I'll use my L&S boot with my sheep feet orthotics. I love the design of the boot (Mountain Hunter Elite) in that they offer more support than a light hiker without being overly stiff and clunky.