Stampin' Up Classic Ink - the new pads.
The new pads on SU inks make a huge difference. I've tried it even using the cheep acrylic/polymer stamps and love how they've turned out. Now I do stamp on a foam pad when using acrylic/polymer stamps.
Here's the same image stamped with Memento Tuxedo Black on top and Stampin' Up Basic Black on the bottom.
Sorry the image is so large. I uploaded from my cell and didn't get to resize.