In all honesty I don't think there should have been a vote in general. With growing issue's amongst various people over time this discussion has arisen a few times. But this was the majority officer vote. I hope that people's vote isn't purely biased because they don't want another app.
Some people's ISP connection's to vent have been bad, configuration's and mic level's have also always plagued us. I was originally all for vent because it was generally easier to use and setup.
Using Mumble The problem's I have encountered are people struggle with it's setup. Not sure why as it is fairly simple but never the less it has been an issue almost every time I've joinned a server someone is struggling to use it.
I have used Discord and Curse and both feel relatively the same to me. Simple to use and may have the added benefit of people posting information in the channel itself. These servers also do not have a User limit unlike our vent server which has a user limit of 50. The limit has never been an issue itself since we had it increased but that does have a higher cost associated to it. Discord and Curse are Free.
Anyway that's my take on the whole issue at hand.