My family has towed thousands of miles with a Voyager and no issues. More sophistication might be better on sales literature but not sure it feels better on the road.
BUT!!! Complaint I have about Voyager is No Digital Display. I've found it requires different settings for City and Open Road driving conditions. It would be very nice to be able to set the controller to where we like it than have to experiment to find the sweet spot again.
On the open road, it needs more brake effort to slow from 60 to 40 than in city to stop from 30. Do the more sophisticated controllers take vehicle speed into account as they initiate and control braking? If they do, that'd be well worth the price.