H&R Block is the best. When you go to H&R Block, you can always stand up and walk out if you don't like the price they charge you. On the contrary, Jackson Hewitt makes you pay if they filed your tax return, regardless if you don't like the price.
I recommend H&R Block. Jackson Hewitt does have the Rapid Refund Loan but you can only get up to $1500 of your refund. At H&R Block its gonna take 8 to 15 days but I still would go to Block because they are better.