Let me clarify some things.
KUOC does not have anti speedhack.
Infact, KUOC has built in speedhack.. for staff only...
INFACT, its impossible to speedhack as a player, no matter what. RunUO keeps track of your walk/run rate and will not let you speedhack unless you are both staff and bodyvalue 0x3db (GM Body)
KUOC uses around 250MB of RAM.
KUOC is not completely threaded (if there is a lag spike, you can't move mouse, open journal, etc).
KUOC cannot target while running.
KUOC is hard to use, no documentation.
That being said, KUOC will show you where the guardlines are, can target based on all sorts of criteria, has a much better radar, keeps track of bandage time, will alert you when you are no longer criminal, and will stack spam messages. KUOC is also smoother, which is nicer on the eyes, but makes you feel as though you are moving slow.
Regardless, there is nothing in KUOC you can't do with razor, as far as pvp goes.