M9K CW 2.0 or FAS?

1-M9k-Its simple to use , there are a loot of weapons and they don't need much disk space and they doesn't cause lag than cw2.0
2-CW2.0-Complex to use,there are a lot of weapons but they need much disk space and they cause lag,they have a lot of suport by the comunity.
3-FAAS-for me they should be the best weapons but,the doesn't have a comunity suport (there are only 2 packs of faas weapons) and the cause lag and need disk space like cw 2.0

For me the best are m9k