IMO, ONR>DP 4-in-1 in every way. And even if it is less effective (which it is not) you get DOUBLE the value with ONR because the dilution ratios of DP 4-in-1 are exactly twice that of ONR.
So to me, 4-in-1 might as well be ONR dilouted 50:50 with water and dyed orange instead of blue.
So to me, 4-in-1 might as well be ONR dilouted 50:50 with water and dyed orange instead of blue.