I've a general question - why glass and not plastic?
My opinion about hall and reed.
Reed switches in a glass tube are good for big magnetic fields/magnets cause they come in
different dimensions and different magnetic fields (stronger..etc) and they are easy to be protected
in a thin layer of hot glue or heat shrink tube or both not making a mess.
Hall magnetic chip's serve more purposes and they are sensitive to magnetic fields like a coil from
a motor or transformer, it's really good for sensitive measures like cables in the wall ..etc
For example for a bicycle to measure the speed I would of chose hall cause they are more sensitive
and can measure faster the change of a magnetic fiend while the wheel spins really fast, in the other
way the reed tube switch if there is no a strong enough magnetic field it will not activate in every
spin of the wheel and give you wrong data/speed.
So it depends what kind of project you got.