I have about four pairs...short (6"), tall (8/9"), insulated, non-insulated...
One of these pairs has got to be about 4 years old by now.
I wear what will be best for the weather that day
TGIF(well yesterday) because I have 2 pairs of soaked non-insulated boots drying out now...and I don't relish the thought of insulated boots on an 80 degree day.