Infill Settings

The image above shows various infill settings. This is a honeycomb infill, which is generally accepted as being the strongest, although the triangle infill is a close second. 

The image above shows various infill settings. This is a triangular infill. Note that 100% infill doesn't mean a full infill on a triangular. Infill. Also note that 5% and 10% are the same infill on this smaller cube.

Here's a link to a good read on strength vs. infill.