I like belt, braces and a piece of string to maintain my dignity. I also like to use all the kit I can lay my hands on while flying.
This weekend I was flying with PLOG and chart (with lines), one built in GPS one handheld GPS RMI HSI and VOR and because I get as much as possible set up before I leave the ground and there's an autopilot I can still find time to look out of the window!
What I use depends on where I am, so I might be using VOR and cross checking with GPS or I might be using GPS and cross checking with NDB. The fixed GPS doesn't have moving map, so the handheld is good for helping spatial awareness and if I can see out of the window I can cross check with the chart and lines!
Use the best available tools for the job in hand is my motto and never ever just rely on one!