HIIT on treadmill - need your recommendation

[da_coolest]

I started doing HIIT workouts 2 week before and I want your help to adjust my workout plan to get the best out of it. I workout daily. following are two programs I found on the internet,

warm up - 5mins, speed 3, incline 1%
5mins, speed 4.5, incline 1%

- 1min, speed 5.5, incline 2%
- 2min, speed 5, incline 0%
(I repeat this for 10 times)

-1min, speed 8, incline 2%
-2min, speed 5, incline 0%
-5min, speed 3, incline 0%

here is my second program:

warm up - 5mins, speed 3, incline 1%
5mins, speed 4.5, incline 1%

- 1min, speed 6, incline 2%
- 2min, speed 4, incline 0%
(I repeat this for 10 times)

-1min, speed 8, incline 2%
-2min, speed 4, incline 0%
-5min, speed 3, incline 0%


which program would work better for me? I can follow any of them without getting myself killed! should I increase the intensive?