Rubber mulch provides several advantages over plant material based mulches, this is in addition to the safety aspect. For landscaping & gardening purposes, rubber mulch can insulate soil from heat. Rubber mulch is beneficial for soil moisture as rubber is non-porous and does not absorb water on its way through to the soil.
In addition to this, you can get Rubber mulch in a ton of different colors to match your desired look of your yard. It also is easier on the feet to walk through than your normal bark chips.