Look at the sophos forums and read about all the users who have migrated from utm to XG. A lot of complaints of either missing functionality or wierd gui based issues. I'd advise to stay away from it for now tbh.
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If you are a new Sophos user, I don't think it is a good decision to pick up the old UTM 9 as it will eventually be replaced by the new version. Then you will have to migrate from UTM to XG and face the new "wired" GUI again.