krav or systema?

Hi all

im now back into the swing of things with arnis and looking to add a second class into my week. being the perpetual student i want to try something new.

my choices.

1. wing chun- i know a lot about WC from FMA so i know it will probably compliment what im doing so no need for info here.

2. Krav Maga- never studied it but now have 2 full time clubs near me in north london. its reputation as Japanese Ju Jitsu with pressure testing seems well established so i'll check out a class soon.

3. systema-i know very little about it. what are your thoughts people? see the youtube and it seems to have been around for ages!!

all thoughts and opinions will be appreciated