Both lighting systems give great growth. If you already have a combo system though I think it'd be cheaper to just replace the one ballast than rather convert the whole system.
14k MH with fiji purple T5 is almost exactly the same as running 50/50 T5 with new generation and fiji purple. Growth is pretty similar I find, between the tank at the store and my tank at home. (T5 tek at the store, 250W DE electronic MH at home). Colour's better at the store but I'm planning an upgrade to a combo T5/MH system anyways.
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Everything I put in my tank is fully dependant on me.
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