The reason would be to treat the dialed number 6208 differently than 6XXX. So if I dial 6208 it would use the first dial peer whereras if I dial 6207 for example if would use the second. If for any reason you need to treat 6208 differently you would create dedicated dial-peer. The session target command in your example is incomplete, but it could for instance point to different callmanager servers.
If you apply the same reasoning to pots dial-peers then you can send out calls via different PRI, FXO ports.
I have tried similar configurations, and found that the dial peer will be matched on the first digit, meaning that 6208 will match the 6... peer. If you change the preference to be lower (2 or higher) on the 6... peer you will get the behavior you want.
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