By far the best explorer for Stellar in my opinion is stellar.expert. Continuous improvements make it a deserving winner of the 5th Stellar Build Challenge and although not mentioned by name, I hope they received a grant in the last SBC for their continued work.
Not only can you look up transactions, accounts, tokens, assets and issuers, but a lot of statistics and in depth data for each of them. All of this is served in a very intuitive interface with a pleasing design. etherscan is probably the undisputed ethereum blockchain explorer but compared to Stellar Expert, there are worlds between the two.