Pros to straight leg:

Uniformity. Straight is straight.

Cons:

If not done properly, leads to knee and ankle issues.
More difficult to do larger distance moves.

Pros to bent leg:

Natural movement of the human body. Easier to initially teach.

Cons:

Harder to clean. Varies by every individual body size and type.

It's purely up to you. You're not going to guarantee a higher area placement switching from one to the other. Uniformity and execution is more important that what your legs do.
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