Neutral Density vs. Dual Polarizers

If im looking to hold back the shutter speed without blowing the image, it's ND filters for me. If im looking to hold back the sky, it's post processing for me.

No way am i wanting to carry around a pack of grad ND filters/adaptors/holde​rs. 2 ND filters (a 2 and a 4 stop) will do nicely. Its a lot easier to bracket your shots and merge them in PS.

Circular polarisers are great for what they do, specifically removing polarised glare and deepening skies but i definately would not stack them.