Person A: 125 – 70 = 55
Person B: 135-100 = 35
Person A's max and min pressure are totally within the healthy range. Person B's max and min are both a bit high. So who is healthier? Most people will think that person a is healthier, but actually it's the opposite. Person A's pressure difference is 55 (>40), person B's pressure difference is 35 (<40). High pressure difference indicates bad flexibility of the blood vessel, and low pressure difference means good flexibility of the blood vessel. A pressure difference of less than 40 is good. Good flexibility of the vessel will allow for better control of the blood pressure and allow for smoother flow of the blood.
Even person A's max and min pressure are all within healthy regions, but the pressure difference is higher than 40, so the vessel is not very flexible. Without a flexible vessel, the blood will not flow smoothly, if the blood pressure suddenly increases, it might result in a broken vessel.
To better the flexibility of the blood vessel, the best way is to physical exercise, and also hydrotherapy I've mentioned in previous post.