I think if the accuracy of the information, then both are the same, because Etherscan or Ethplorer comes from the same source, MyEtherWallet. But to detect exchanges, it is easier to use Etherscan.
It all depends on the comfort of everyone in using it. we cannot compare it based on our comfort. everyone has their comfort. both remain good in my opinion.
I'm not talking about user comfort, and I'm not imposing my comfort on others. What I discuss about how to detect exchanges with Etherscan. So the OP can check directly the value stated on Etherscan based on active exchange. Because the basic question is "which of the two are you using to check your wallet."