Hi
can any one explain to me what's the difference , i know that 3333 for CPU mining bt other's how can i chose !

Mining Pool Connection Details
 
Mining Ports

 Port: 3333
 Starting Difficulty: 100
 Description: Low end hardware
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 Port: 5555
 Starting Difficulty: 2000
 Description: Mid range hardware
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 Port: 7777
 Starting Difficulty: 10000
 Description: High end hardware
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 Port: 9999
 Starting Difficulty: 100000
 Description: Hardcore hardware/nicehash
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 Port: 10000
 Starting Difficulty: 650000
 Description: For the thugs