  A comparison of light hypernuclei production, from UrQMD+coalescence and the
thermal model, in heavy ion collisions over a wide range of beam energies and
system sizes is presented. We find that both approaches provide generally
similar results, with differences in specific details. Especially the ratios of
hypertriton to $\Lambda$ are affected by both the source radius $\Delta r$ of
the coalescence procedure as well as canonical effects. On the other hand, the
double ratio $S_3$ is almost independent of canonical effects, which is in
contrast to coalescence. Thus, both the beam energy dependence and centrality
dependence of $S_3$ can be used to constrain the hypertriton source radius. To
do so the currently available data is not yet sufficient. Elliptic flow is
shown to be unaffected by the source size of the nuclei and an almost perfect
mass scaling of the elliptic flow is observed. Our predictions further suggest
that the existence of the H-dibaryon ($\Lambda\Lambda$) seems ruled out by
ALICE data.
