  Various decay modes in superheavy nuclei have been of significant interest
among which cluster radioactivity has recently gained sizable attention. The
{\alpha}-decay being a predominant decay mode in the superheavy region, the
accurate determination of cluster decay half-lives is also crucial in this
region as it has tremendous potential to be explored as one of the major decay
channels. The usability of the Royer analytical formula [Nuclear Physics A 683
(2001) 182], which is based on the asymmetric fission model, has been
investigated for the cluster and {\alpha} decay in superheavy region, by
comparing it with several other (semi)empirical/analytical formulas. After
fitting the formula on around 100 cluster-decay data and around 423
{\alpha}-decay data, the refitted Royer formula (RRF) is found to be very
robust which is able to estimate the cluster decay and {\alpha}-decay
half-lives with good accuracy. In fact, a comparison of the half-lives of both
the decay modes using the same formula points towards a substantial chance of
heavy cluster (Kr and Sr) decay from various isotopes of Z=118 and 120. Hence,
the formula proposed in this study works fairly well for the estimation of
cluster decay half-lives in superheavy regions where most empirical formulas
fail to match with the half-lives from the various established theories.
