Well, basicly, most of acars software do the same. From your point of view, there should be no chioce for people that want something different.
If there is kACARS_Free, no other shoud exist.
If you see no difference by just looking at CAVacars window, sry but cant help you.
As i already wrote, if you dont like it, dont use it.
There are people that do use it no mather what you think.