hi,
do you have experience in using ulink? by that I mean do you have a game or an application that is already live, with a ulink server etc etc? I am not affiliated with photon or playmaker, but I know that photon cloud offer is amazing, first it's free... second, no server side needed at all, it just works. And I haven't found a similar offer with ulink, I might be wrong tho.
So unless you have precise requirements outside the scope of photon cloud ( like MMO mainly) then yes you'll need to handle the server side, but then the level of expertize you will need to reach in order to create your game or application is well above the skills required to port ulink or photon to playmaker.
so, could you share your general idea and use case of ulink? this will then be easier to guide you, and why not consider ulink ( at least for me to create a playmaker port I mean).
Bye,
Jean