I also wonder what has brought you to the frame of mind that these are the two breeds you are considering. They do fulfill two completely different niches. If you are considering Beefmasters, what has made you eliminate the thoughts of other American breeds like Santa Gertrudis, Brangus, Red Brangus, etc.
If you like Salers, what do you hold against Gelbvieh, Limousin, or other continental breeds.
Personally, for a replacement female, I would go with something with a little ear on it and is consistent in its phenotype. That eliminates both breeds you have inquired about.