Lamang ang Cedia sa front leg room. Rear knee room halos pareho lang. Lamang lang ang Vios sa flat floor. The higher floor of the Vios may be a negative for some pero my mom likes it because it's kinder on her knees.
Wider ng konti ang Cedia so elbow room is also better. Mas mahirap lang sumimple sa "oops legs mo pala yon dear kala ko kambyo"

Sa Vios din sumasabit ulo ko minsan sa door sill. Never had that problem with the Lancer.
Trunk space goes to Cedia. So does rear view through the glass. Mas malaki ang side mirrors ng Vios pero malaki din blind spot nya sa A-pillar.
I got used to the center gauges after a few weeks. Wag lang magpanic kung biglang nawala ang ilaw ng gauges sa gabi. Tingin lang konti sa kanan andun lang sya

My kids actually like it because they can see the revs and the speedo move. 100kph for them is slow.
4g92 SOHC non-MIVEC pa rin ba makina ng Cedia? Medyo old school na sya compared to the 1NZ VVTi ng Vios (although the 1NZ/2NZ are not spring chickens either). Vios has electric power steering so one less fluid to check. Timing chain na rin ang Vios so less maintenance in the long run.
So it all boils down to your priorities. Kung kelangan mo ng space and comfort get the Cedia or consider the Sentra GX. Pero if you need a city driving war car get the Vios.
Oh and if you plan to use your Vios on the hiway ok sya walang problema. Just hold on tight when passing a bus/truck/wang wang SUV at siguradong mapapakabig ka sa hangin

Cant imagine kung anong feeling ng Alto/Picanto/i10/Spark kung nag-overtake ng bus hehe