As I only had a few selections in portrait orientation I think I will most likely be choosing to use landscape. However this will depend on which images I narrow my selections to, all images also still need some adjustments and straightening.
On that note I decided to experiment with cropping the portrait photographs to square to see how well this worked and if it would help with presentation alongside the light box images. Surprisingly most images cropped without too much loss of information.
It could in fact work, hmm more to ponder now!