Garmin and Lowrance live are both pretty much the same technology. You choose which brand you prefer.
Low end Garmin system with 9" screen with Livescope close to $2,500. You go up from there depending on screen size and other stuff you may or may not want to add besides Livescope.
If it was me, I have Garmin. It has issues, so does Lowrance. Garmin cannot correct ghost tree/dead spot issues many of us are having since they introduced Perspective View. Garmin has released several software fixes for this that do nothing!
At this point if I didn't already have Livescope I would be willing to wait and see what Humminbird has coming out soon!
That being said I've had Livescope now for about 2-1/2 years and can't imagine fishing without it even with its issues!