For the past 3 days I have been running the 65 and V-1 together. (yes I know this can cause problems but they get along well for now)
I can say this. The V-1 3.825 is much quieter than the RX-65 on falses. 85% of the time the RX-65 went off on falses before the V-1 did. I did make some videos of this but it's easier to put into words. Now the v-1 did alert to the false but the RX-65 picked it up first.
Now for rear falsing there is no comparison the V-1 will just false a lot more. But that is expected with the rear antenna. I am sure I am not telling anyone something they didn't know already. But if you didn't well now I guess you do. I will try to run some x-50 stuff in a few weeks.