You should check out GET. If they are lucky, they might become a (small) competitor of Ticketmaster in the future.
Chances are small but I believe that they will atleast grow once events can go back on sale.
It seems that this is still too risky to have because it is still in vague predictions, so it would be very good if someone could choose the proven one as the OP himself said, even if he wanted to choose another one, it should be in a good rank right now.