Granted the Prelude has a more up to date patch set..., I would still take the E-50 over the Prelude any day. The E-50 has much more going for it IMO. Plus the E-50 has many other features that put it above the Prelude. I'd say the Prelude is really the step up from the E-09, but a step down from the GW-8.
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.