Terrain capture sand area with rocks

Hello, I have to capture with high detail a large area that contains rocks and saνd is near the sea.

What is the best method?

Combining orbit flights and grid flights with camera to be in 60 degrees?

For now I have a phantom 4 pro?

 May I need RTK version of phantom for best results?

Ι was thinking also to add a terrestrial laser scanner. 

I know that context capture has some problems aligning images when mixing orbit and grid flights sometimes.