You're going to miss one of them leaving, that's for sure, but which one most? Sounds like you need a coin to flip. The pain of seeing someone driving a twin of the one that you chose to sell isn't fun, but, would be lessened if you saw it while driving the 4.6. Take the knowledge learned in the time of owning your 4.4 and apply that towards the care of the much rarer bird. IMH(biased)O. If nothing else, look at this situation as a win/win.
