Thermally, the all foam Super Spacer is superior. Structurally, it is not. In fact I would not use Super Spacer for that reason.
If you have a choice look into Cardinal's XL Edge spacer. Several major window companies use them. Accelerated testing shows theirs to resist failure much better than most of the major available spacers.
I seen excellent durability from the Super Spacer over the years, and in fact have seen a far higher rate of seal failures from Intercept. I will agree however that the Cardinal XL is very good as well.