If you could either have the powers of Spider-man or the Green Lantern, which would you choose, and why?
... somebody's not really trying.
The answers I could read seem to fall into two categories: "Green Lantern, obviously", and "Spider-Man, because I don't know anything about Green Lantern."
Let's assume that "the powers" don't include the quirks of the particular secret identity: if I get Spidey's powers, I don't get Peter Parker's constant parade of personal catastrophes. If a little blue guy hands me a green ring, I don't suddenly become prone to recurrent head injuries or finding loved ones stuffed into household appliances.
It's still no contest.
On the one hand, we have The Proportional Strength of a Spider.
On the other, we have The Most Powerful
It's a starship on your finger, complete with tractor beams and replicators.
Yes, since the '90s, the writers keep calling the ring "the most powerful weapon in the universe", but to me, the question isn't "how many asses can I kick with these abilities?"
It's "how many lives will these abilities let me save?"