Hello Mario
UKS (alias LSD) is the first choice for systems with an odd number of electrons or if an overall multiplicity greater than one is required. ROKS is special and not all feature available with UKS are also implemented with ROKS. ROKS employs only one set of spatial orbitals which can be either doubly or singly occupied (or empty, of course) whereas UKS works with two sets of singly occupied spin orbitals, alpha and beta, i.e. ROKS implies compared to UKS a constraint concerning the spatial wavefunctions. You can find further details in any quantum chemistry textbook like the Szabo and Ostlund.
HTH
Matthias
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Yes.
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