This is the safest pairing on the list because the two faces share a skeleton — Roboto Slab is Roboto with slab serifs added. The x-heights and proportions are identical by design, so headings and body read as one sized system with zero friction. The slab serifs give the heading just enough weight and texture to lead, while plain Roboto stays clean underneath. You genuinely cannot make this combination look mismatched.
This is the safest pairing on the list because the two faces share a skeleton — Roboto Slab is Roboto with slab serifs added. The x-heights and proportions are identical by design, so headings and bod...