I've found the SIlat styles give more emphasis to empty hands. Sure they have excellent knife, sword, pole, stick, sarong styles but the difference being that you are more often taught empty hand jurus, etc first. Where as a lot of Kali teachers will go with sticks first and move to other weapons and empty hands later. Or, will do a little of all of them. Knife Stick, empty hand at the same time. Other than that, the conecpts really are similar that it is merely a matter of personal preference. There are however, thousands of Silat styles in comparisson to I believe hundreds of Kali styles. The theory being that Kali is dervied from certain Silat styles. Hence Silat usually containing many animal forms which leads certain historians to believe it is connected to or derived form Chinese styles as well as Indian. You might want to search for an instructor in each of the arts. Then take a few classes of both and compare for yourself. See which you prefer. After that you can use your judgement as to which has the "economy of motion" and practicality or art and discipline that you would like in your life. Good luck!