  The Richards family models comprise a well-known set of models with useful
parameters to describe several aspects of disease outbreaks. Some of these
models have been used to study the current Covid-19 pandemic. However, there
seems to be confusion regarding the discrimination among competing models. In
this paper a detailed application of Akaikes information approach is used to
discern among models using data from The European Union, The United States and
The United Kingdom. We argue that the epidemiological characteristics derived
from competing models should be examined to complement the selection strategy,
and the implicit properties of the models contrasted with the available data.
Detailed analytical expressions of the epidemiological characteristics implied
by the selected parametrizations are also offered.
