Personal choice to be honest!
Cccam 2.2.1 would be the newest version...
2.1.4 is used a lot also...
And 2.1.3 would be the more common one when using oscam...
Take note a lot of people won't share with you unless your using cccam 2.1.4 or above, due to the fact it is possible to fake cards with 2.1.3


