I haven’t heard about hummingbird coming out with a live option. Need to do some research.
I read somewhere that Lowrance pretty much threw in the towel after a couple of attempts to match the Panoptics that has been out 4 years now. The folks that have mastered it are boating some impressive catches.
Lowrance came out with 'Active Target'; similar to live scope, and I think pretty close in image quality.
Lowrance's first try was 'LiveSight' and I think it wasn't as good as they'd hoped, but it's still available.