Only you can determine that, based on how and where you hunt long range. Type of terrain, coupled with the conditions can be a game changer.
If you hunt from stationary positions, especially the same ones year after year, you can usually adapt the locations to suit your preferred method at least to a point.
The vast majority of all PA long range hunting/shooting is from some type of bench. Be it piled up rocks, a board nailed on a stump, or a small portable one carried to the location.
It would be rare to hear about someone preferring prone/bipod there primarily due to terrain and other restraints. So to sum it all up, conditions will decide that for you to a large degree.