Categorisation of excited states occurs prominently via different measures of charge transfer, which are a natural choice for push-pull systems as studied here. However, special care has to be taken for symmetric systems, including the molecules studied here, noting that the dipole moment and related charge displacement metrics are not reliable descriptors for the charge transfer character in symmetric systems. A powerful option to overcome this problem amounts to base the analysis on a correlated electron-hole pair within an effective exciton picture; and this was shown to be particularly suitable even for challenging cases with high symmetry. Aside from categorising excited states, there has been an increasing push toward a rationalisation of the underlying energetics and, in particular, the singlet-triplet gap. The applied approaches range from a formal discussion of the underlying molecular orbital integrals to a direct extraction of computational data from actual electronic structure computations and applying it for energy decomposition and visualisation. It is the purpose of this work to exemplify the above discussion on four different TADF candidates highlighting their intricate photophysics as well as methodological challenges in the computational description. The four molecules studied are shown in and Cz-AQ have been previously synthesised and characterised. We will study these in detail moving on to predicting the properties of Cz-BDT-SO 2 and Cz-BDF. Within this work, we contrast these four related molecules highlighting the profound changes in their observed photophysical properties following seemingly inconspicuous changes in the acceptor unit.