After messing with a pair of chillers water/water my service leader mentioned that all of us is comfortable with different types of refrigeration applications, small machines, big machines, chillers, dx systems, split units and so on. I might be uncomfy with chillers. But what the heck... To learn you have to "saddle the horse" even if you get throwed off the horses' back.
Ah yea... The big Q is... What type of application is mest comfy for you, and what type is the most uncomfy?
For me the Most comfy is Middlesized and bigger, spec the semihermetic ones, Ammonia is my big uncomfy, almost feel raped after a work on a ammonia circuit.