Powerhead question

[fido19]

hey guys thanks for further feedback
the dimensions of my tank are as follows 50"length,15"width and about 21" inches height
the tank was purchased from craigslist
but any ways is there too much difference between tunze and vortech, i mean i understand the price difference but quality wise which one would be better

also as of now i have the usual hermits,snail(turbo) and crabs, they are about 60 or so in number
i have been thinking a lot about the vortech line and am just worried that it will not perform to my expectations if someone was to give me an honest to god answer as to how they are i will really appreciate that