Shoulder strap. I also use a quick release belt clip when I am not doing a lot of walking but switching cameras a lot.  It also depends on where I am. If I am hiking, in a natural dirty environment I will stick my cameras back into the bag and move between shots with them protected.  I am actually in a situation now where my D810's have to go in to Nikon for a deep cleaning. This means more than the sensor.  They have to disassemble and clean the innards. I cannot get the dirt/dust to stop infiltrating my sensor.  So my time lapses are VERY HARD to fix in many cases to remove sensor spots.  This was caused by a weekend of hard shooting in the desert where I just used a strap. Cameras got killed by the dry, dirt environment as I moved around from shot to shot.  The point I am making is that straps should be used with caution depending on the environment you're in, such as a dusty desert   Different story at the zoo, though

I have never tried these kind of straps.
Is it not uncomfortable when it bounces on the hip or on the leg?