DPI for canvas print

[john.margetts]

For changing the resolution of a photo, Photoshop CC 2015 offers several different algorithms:
• Automatic
• Preserve Details
• Bicubic Smoother
• Bicubic Sharper
• Bicubic
• Nearest Neighbor
• and Bilinear.

Photoshop image size and resolution

I use Gimp which offers a similar range of algorithms. For demosaicing I use UFRaw which offers m five different demosaicing algorithms. What is the relevance of having choice?