I have a Toshiba Satellite U400-DW2. It needs a new power supply. Which should I buy?

The website and the laptop say that it should have a 19V - 3.95A power adapter. However when I look at the website the replacement adapter that is supposedly compatible is a 19V - 6.3A adapter. The 19V - 3.95A adapter is apparently not compatible with my laptop. Should I buy the adapter the Toshiba site recommends or go for the one that matches what it says on my computer?
 
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