performance issue in the fields.

create table a( address1 int,address2 int,address3 int)
create table b(address int[3])

I have created two tables. In the first table i am using many fields to
store 3 address.
as well as in b table, i am using array data type to store 3 address.  is
there any issue would face in performance related things.... which one will
cause the performance issue.
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