Jump shapes - What's more important?

[Bushwacked]

Just been riding the track that has been built near me and it needs some tweaking to get it running nice but is gonna be good once it is sorted.

I've just had a long discussion with someone down there which has led me to ask this....

What's more important on a double or triple or a roller, is it the size of the transition, the shape or the overall height of the jump?

Bascially if the jump is small (1m high) but not shaped that well, so pumping is hard, can shaping it to make it pump better be more productive than not changing the shape but making the jump higher or the transistion longer (meaning keeping the jump the same height but removing earth to start the transision earlier and make it longer but the overall height stays the same)?

Does that make sense?

[evamedia]

steeper lip, and even steeper landing for a trails style jump. I know nothing about race tracks

[Bushwacked]

Nick - thinking more 1m high rollers and doubles about the same size if not slightly bigger (Starting small to begin with)