i use tubs for racing and would never use them on a training ride!
tubs tyres are £100 each end (roughly)
also tub rims are just as expensive as normal rims but are harder to get.
open pros are they way to go from past experience. mine are 2 years old and are still true after 2 years as cx wheels and now on my main road bike.
they will be be getting cx tyres on them in the winter and be used again this year.