HIIT routine question

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Ok so iv'e been trying out HIIT for the past few weeks and I just have a quick question regarding routines.

Theres two different ones I have tried but I dont know which one would be best for fat loss.

Routine 1 -
2min warm up
20sec high/60 sec low x10

Routine 2 -
2min warm up
15sec high/40 sec low x14

I definitely feel more of a burn doing routine 1 solely because of the extra 5 seconds of high intensity, it seems to make a big difference with the difficulty. However my ratio with my second routine is a lot better and I can do it for a bit longer.

Any ideas on which one i should try and pursue?

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