Firstly if the supported upgrade paths includes
CA Clarity PPM Version 13.0 or Service Packs
Supported patch levels:
– 13.0.1.1 through 13.0.1.8
direct upgrade for you is supported.
After having completed recently an upgrade to v13.3 from 12.1.3 and having been stuck at 1.30 leve for a while - see
https://communities.ca.com/web/ca-clarity-global-user-community/message-board/-/message_boards/message/108720991?p_p_auth=lALiBn3n&#p_19
I should go with direct update to v13.3.
That is because if there are no issues it will be simpler and faster and go smooth. If there are issues they are likely to come up in 13.0 to 13.1 step.
The upgrade to v13.3 will go in internal steps anyway.
The best option would to copy your system to a test environment and test the upgrade there and not be time stressed for the upgrade to be successfully completed and not have adequate time to solve any issues.
Martti K.