The RFIC company I worked for let the engineers have
both because they were largely complementary. Some
things you need done, only one of the two will (or would
at the time) do. And there's no surer way to p!ss off an
experienced and expensive engineer than to make them
use a tool they know is incapable of the task. Much better
to just buy more tools and tell them to share nice.
Where the radio guys were working, was around where
you'd expect to transition design styles and tools - cell
phone high band, higher than that but only for switches.
Switches ended up needing some fine EM simulation on
the FET stacks, the LNA and PA guys were hard over for ADS,
for the fancy RF analyses as I made it out. The PLLs, power
management and ASICs were Cadence all the way.