This isn't strictly a comparison of the same phone with a contract and without, since it's compared to the nexus one without a contract, but a more detailed search will turn up some (some have been posted here on hacker news).
Other than what's outlined in that comparison, what other benefits are you thinking of? It mainly comes down to price, and often the total cost to the consumer over the length of the contract is more when the phone is subsidized vs when there is no contract. There's a perception that the the subsidized price is cheaper (just like how government subsidized student loans are cheaper because the government initially "pays" the interest), but I think often the phone is just being paid for in installments in each monthly bill during the contract.
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More so than things like this, which is 6 months old? http://www.billshrink.com/blog/6847/nexus-one-vs-iphone-droi...
This isn't strictly a comparison of the same phone with a contract and without, since it's compared to the nexus one without a contract, but a more detailed search will turn up some (some have been posted here on hacker news).
Other than what's outlined in that comparison, what other benefits are you thinking of? It mainly comes down to price, and often the total cost to the consumer over the length of the contract is more when the phone is subsidized vs when there is no contract. There's a perception that the the subsidized price is cheaper (just like how government subsidized student loans are cheaper because the government initially "pays" the interest), but I think often the phone is just being paid for in installments in each monthly bill during the contract.