I have recently installed Gene6 and I have found it to be very fast and stable. I have not tried Serv-U so I cant compare but Gene6 does have my thumbs up. I like the admin - very clean and works well with Helm.
Serv-U is way better. I remember Gene6 have some problems with large sized directories where as Serv-U just goes right through it no problem. Serv-U all the way
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