Although you cannot keep both frames on the screen simultaneously, an Outgoing frame can be called forward. Try as many programs as you can, then decide. Each program has a certain appeal to certain people. Most of the major programs can be downloaded from the authors' websites. Each author has his own way of reminding you that you should Register and pay a registration fee.
Upgrades are usually free, except when a major change has been made.
Don't balk at paying the author a fee. He has spent a lot of personal time developing the program and they deserve some compensation. Frankly, trying to identify the so-called BEST program is a waste of time. Such discussions are full of subjective opinions and are not worthy of discussions. I never met a man who didn't think what he had or owned wasn't the Best in the World.