Get the maxi jet for sure. It's cheap, quiet and runs cool. It's even rated to run outside of the tank without being submerged. Many other brands would just burn up if you tried that. I used one to build a canister filter a while back. I had the maxi jet mounted outside of my canister (glass jar).
I can't really say anything for the tunze as i've never used one but if it really costs 20 times more, I say save some money and get the maxi jet.