When should I use a platform predicate method (#platform?, #platform_family?) vs a case statement?

default.rb

# If you have a simple conditional, use a predicate:

if platform?("ubuntu")
  # do things only applicable on Ubuntu
else
  # do things on everything else
end

# If you have a complicated conditional for multiple platforms, use a case statement:

case node['platform']
when "debian"
  # ...
when "smartos"
  # ...
when "freebsd"
  # ...
end