The Countervail technology incorporated into the Blade 98 frame means that when the ball hits the strings the energy created travels around the frame and not up your arm, which gives you a more comfortable strike.
Research shows that as a result, over time you will be less fatigued because you expend less energy on each swing. That could just make the difference between winning and losing. If the technology is good enough for NASA then it must be good enough for earthly tennis courts.
The Blade 98 has a reasonable sized sweetspot so it is forgiving if you hit the ball slightly off-centre and the 18 x 20 string pattern offers more control and feel than a more open string pattern.
b) 18 x 20
c) 16 x 18