like to know which method is best to use

I am using File Persistence In which i need to retrieve the parent data as well as child data

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Example

Parent

Sync_Key FirstName LastName

00000002 Saravana Kumar

Child 1

Sync_Key Mobile Number#1 LandLine NUmber#

00000002 9845200775 080-41288892

Child 2

Sync_Key Primary-Email Secondary-Email

00000002 sarvana@gmail.com kumar.s2m@gmail.com

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the sync_key of a particular node for each row will be unique.and the

sync_key for child table node will not be the same.the relatationship

will be maintained using PSYNCKEY

at the child node that will be the sync key of parent. for example:

<b>Top Row</b>

Sync_Key 00000001

Name Rajan

Specilaty IM

<b> First Child Row</b>

Sync_Key 00000002

PSYNCKEY 00000001

Desgn PNP

<b> Second Child Row</b>

Sync_Key 00000003

PSYNCKEY 00000001

Phone_No 012-234-0980

is there any difference between this 2