Whilst neural shoe polish has it's uses, I wouldn't advocate using it instead of it's coloured/pigmented counterparts on a regular basis.
With sustained use of neutral polish, the higher solvent properties, will strip and therefore overtime dull the vibrancy of your shoes.
It's effects are most noticeable on shoes with antiquing or crust leathers. You'll find some shoe manufacturers don't recommend it for routine polishing.
My own experience of Saphir neutral is that it's easier to get that high shine on the toe cap when doing the spit/shine method using neutral polish. I am not using it for long enough to comment on the crud buildup, however I don't see any evidence that the neutral polish has higher solvent properties than the colored polish. In the case of Saphir they all have the same formula written on the tin, turps, carnauba and beeswax.