Portal upgrade on new hardware

Hi All,

We are using SAP Netweaver Enterprise portal 7.01 for which we are planning to upgrade to 7.3 on New hardware Database will be changing from Oracle 10.2.0.5 to 11.2.0.3 and OS from RHEL5 to RHEL6.

1) Can we do fresh installtion of 7.3 and deploy all the DC's (after migrating to 7.3)

                                   OR

2) Take the system copy of the existing system and upgrade from 7.01 to 7.3

Kindly suggest the best way with pro's and con's

Regards,

Lalitha