  We investigate how the Fine-Tuning (FT) in the B-L Supersymmetric Standard
Model (BLSSM) compares to the Minimally Supersymmetric Standard Model (MSSM),
where both models have universality. This is done for two scales: both low
(i.e. collider) and high (i.e. Grand Unified Theory (GUT)) scales. We see this
is similar for both models and the two scale regimes. We also study the
possible Dark Matter (DM) candidates each model offers in a realistic scenario
satisfying relic density constraints. Our findings are that whilst the
parameter space for the single MSSM DM candidate is severely constrained, the
BLSSM offers multiple candidates in a much wider region.
