Mesh, terrain or box collider?

Hi,

I have terrain mesh that has a simplified version I can use for collision detection. It is in quads (rectangles). I have overhangs and would rather not go the terrain collider route but will do a workaround if it is above and beyond more efficient. The terrain meshes are in the order of a few thousand quads (that don't necessarily stitch at corners but are all aligned so there are no gaps). I could make them into box colliders with a reasonable thickness if this is a good option.

So the question is, should I use a mesh collider, a set of box colliders or convert the mesh to a terrain height field (or something else I am not aware of). If you think terrain collider by what factor of performance improvement are we talking? A hybrid with a terrain collider and additional boxes could be worked out if that is a good option.

I am Unity 2019 and can upgrade to 2020 when it is ready if that helps with all the terrain improvements they're working on.

 

I self using box collider, which i import from blender, so you also need to care about the degree, because the box collider's doesn't addapt a inmesh rotation, just the routation from outside.

for a terrain i would use a mesh collider, ir would be a lot of work to adjust it with box colliders/also in blender