I use both, the Amazing concealer is fab, it totally covers the dark circles by my eyes. It really obliterates them, just a few tiny dots, blend gently with ring finger and that's it, good to go.
I use the Erase Paste on days when I feel like I need less coverage. It has a great texture and I dot it on (I do need more of this than the Amazing concealer), I then leave it for a minute to warm up and then blend.
I think both have their place and as I am a self confessed beauty addict I am always on the hunt for the newest and best product and have always gone back to Amazing cosmetics concealer time after time.