The big disadvantage of the choke input is that you need a minimum current draw or the voltage rises to the cap input value. Another is that spikes can occur that will kill solid state rectifiers. The advantage is the you can get more power (~10%) from a given transformer although at a lower voltage. Ripple can be lower and more like a sine wave than a sawtooth.
The (Greek letter) pi filter is the best at getting rid of ripple. You don't need a 5 or 8 Henry choke unless you want to use 10uF or 22uF caps. I built a 150W bass amp with pi filtered B+. First cap was 100uF, choke was 300mH, final cap was 235uF. Ripple at full power less than 1 volt peak to peak. For a guitar amp, low ripple doesn't sound quite right. On the mellow side, not as agressive or in your face. An example is the 70's Sunn Model T.