I have been using my Kingone/avenger winch with synthetic rope now for over two years and it has had a flogging (always pulling Hiluxs out of the crap lol) with out missing a beat.
I chose this for the price and also the comparo i read a few years back seemed pretty comprehensive and it won the overall test for price and reliability, current draw was almost identical to the WARN, and after being fully under water and still being used it took no water.(which i have since tested my self)
As for the cable v's rope i can honestly say i have done no maintenance to mine and it is still looking perfect and it has been used in all conditions.
Yes you do have to be carful with it on rocky ground, BUT if it does snap you can just tie a knot in it to get you out of the poo, try doing that with a cable
.
rope of the same diameter as cable is STRONGER.
you can buy a replacement rope for around $160 for 40meteres! most cables are max 30meters
cable is easily kinked and then becomes a nightmare too re-spool and also creates a weak spot
cable retains "memory" so when its not taught its a mess (hence how easy its kinked)
cable is allot harder to clamber up a slippery wet hills with ect when unspooling
i have seen cable fail at the "swage" that clamps it back onto itself at the hook end and with out a suitable crimping tool it becomes useless.
its bloody heavy, more then 10kgs heavier
like others have said about the wire splinters making thick leather gloves a MUST
rope floats
you only need a simple alloy block for a fairlead one thing less to have a problem with compared to the rollers
-----------------------------
cable wont melt, so if you live in a fire risk area that may be a factor ( towing a burning log off a track ect)
cable will handle chemicals allot better.
cable is needed with old winches which generate allot of heat through the braking drum system and REQUIRE cable due to the heat.