There's a big difference between comparing a Dude or a Gilchrist to a Loar and (for example) a Savannah to (again, for example) a Collings MT.
A Savannah is frankly not good enough for me, but a Collings MT is.
As to the differences between a Dude and a Loar, I don't suppose I'll ever know.
But can we please get away from thinking in terms of bluegrass?
Do you honestly think that people like Carlo Aonzo or Avi Avital would sound as good (never mind be happy with) some cheap mandolin? Of course not.