I'd rather have Superman's powers, but if i had to choose who i'd rather be i'd be Thor because of his experience, fighting skills, royalty, pride, accent, etc.
Thor. How could you say no to wielding mjolnir?
Absorb and redirect virtually any energy, indestructable head to hammer with, fly, jump dimensions, call down the elements - plus add super-strength, warrior skills, and a super-manly armoured appearence...oh yes.
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"I'm not smart so much as I am not dumb." - Harlan Ellison
The question asks: Who's powers would you rather have? That means you would suddenly get that person's powers and use them in YOUR life. Thor's powers are for the most part damn useless. Superman's on the other hand has literally millions upon millions of different applications.
Practical? Whoever had Thor's power in the real world will be practically god himself. Transmuting elements, making tropical storms or hurricanes cease by sheer thought. End all of earth's wars, and watch via the Mjolnir(like closed circuit TV) whatever he wants to. X-ray vision? Bah!!! X-ray can't see through lead or very dense objects. With the Mjolnir you could look into anyone's house/building via closed circuit TV being anywhere near a shower or locker room.
At a very BASE level by making rainstorms. That's it.
Superman's powers have enabled him to create 14 new energy sources.
C'mon people THINK. Think about what you do with your daily lives.
Forgot what the chemical equation for cyanide is? Use your telescopic vision to find cyanide than use your microscopic vision to figure out the answer.
Wanna learn a new language? No prob. With Superman's powers, you can learn a new language in seconds.