After 10 years of doing this, I generally will go long on one, short on the other. Either the PU or the CA will delist at zero. (occassionmally, both but lets not dwell on that.)
Both long means you definitely lose on one or the other.
The only case I could see is if the option dropped down to pennies and the long was a virtual no loss. You would have to be switching positions late in the game. (Similar strategy with a lot of options, such as Academy Award or Nominoption where there is little loss vs. large gain)