Full Wave Bridge Rectifier vs.centre tap rectifier
You can get more current from a full-wave rectifier/capacitor than a CT transformer rectifier because each half of the transformer secondary is used 100% of the time rather than 50%. You can generally get about 25% more DC current from the same transformer-rectifier-capacitor circuit by using 4 diodes and ignoring the CT rather than two diodes. 

In the below circuit XFMR1 is rated for the same VA as XMFR2 but double the voltage CT. 







simulate this circuit &ndash; Schematic created using CircuitLab

You do lose one more diode drop in voltage with the full wave bridge.