I think with fresh water the difference is very little, more what budget you want.
a decent led fixture will do the depth and light the tank up but will cost you 4-5X the amount of t5s
T5s will be fine but you may have to replace bulbs every 9-12 months if you plan on growing plants
MH will be cheaper setup cost and run the whole tank very easy but you may require a chiller depending on the stock and they use more power.
MH>T5>LED is the running cost way else its a single t5 light but you would need a few.
Leds will last longer and wont produce more heat but a decent unit will cost you a bit more. MH would work best but cost a lot to run compared to others and produce a bit of heat.
Saying this I would go for a decent LED fixture or a cheap LED fixture and hope it works to your needs or a MH setup. In the long run they will do a better job lighting the tank. I am certain a decent LED fixture will work some reef growers have the same depth and can grow corals almost at the base!