There is no reason to switch. You are not going to hear a difference between the two boxes IMHO.
Also, while Dante is a great way to expand your I/O and I utilize it myself, it is also opens up a lot more places where some setting could be wrong, or some device fails, which breaks the system. I personally would never choose to use a Dante stage box when a non-Dante box works just as well. The non-Dante box has less potential failure points than the Dante boxes. You are asking if there is an advantage to using Dante boxes and I would have to say no, the opposite is true. There is an advantage to using the non-Dante boxes IMHO. They have less latency and are more reliable (less places for something to go wrong) than the Dante boxes.
Now I’m not saying there is never going to be a good reason to use a Dante stage box. There are situation where a Dante box works better than a non-Dante box. But connections from a FOH position to a stage in the same room is not one of them IMHO.