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In this paper, we perform a comparative analysis between the future proposedlong-baseline experiments ESSnuSB and T2HK in measuring the leptonic CP phase$\delta_{\rm CP}$. In particular, we study the effect of the neutrino massordering degeneracy and the leptonic mixing angle $\theta_{23}$ octantdegeneracy in the measurement of leptonic CP violation and precision for bothexperiments. Since the ESSnuSB (T2HK) experiment probes the second (first)oscillation maximum to study neutrino oscillations, the effect of thesedegeneracies are significantly different in both experiments. Our mainconclusion is that for the ESSnuSB experiment, the information on the neutrinomass ordering does not play a major role in the determination of $\delta_{\rmCP}$, which is not the case for the T2HK experiment. However, the informationon the true octant compromises the CP sensitivity of the ESSnuSB experiment ascompared to T2HK if $\theta_{23}$ lies in the lower octant. These conclusionsare true for both the 540~km and 360~km baseline options for the ESSnuSBexperiment. In addition, we investigate the effect of different running timesin neutrino and antineutrino modes and the effect of $\theta_{23}$ precision inmeasuring $\delta_{\rm CP}$.

A comparative study between ESSnuSB and T2HK in determining the leptonic CP phase