PCB Design Considerations - Copper Pouring
For signal integrity reasons no pour is better than a pour that is floating.  When you have a floating pour you are increasing the coupling capacitance between signals so you are increasing the chance of cross talk.  In general the pour that is grounded will perform the best, but you should be aware of image current flow.

In general your pour should also be on both sides of the board and be part of the ground net.

also your pour needs to edited- the circled areas should be removed (as an example - there are many through out your board).