Get 640 and this is coming from one that owns both a Pulsar Telos XP50 640 unit and the New AGM Seeker 25.
The AGM is one of the best 384s I’ve looked thru but if i can only have one it will be a 640.
By the way you will end up with a thermal scope if you buy you a scanner.
That red light can work with a scanner but in the end you will want that thermal rifle scope as well i promise!