I have 2 for blowing out the aircraft hangars.
The best Ego 56V blower I could find which was the 650CFM 5.0AH.
The Kobalt 80V 650cfm.
The Kobalt does not have enough oomph to blow pebbles out of the hangar. 10-12 minutes on turbo. So while it blows well, it is just not quite enough for my needs. I've moved it to the smaller T-hangar. Where it's a better fit.
The EGO can move the pebbles, but it takes "turbo" mode, 13 mins on turbo. The battery dies before the hangar job is done. The EGO does a good job on a medium pile of dry leaves. But I found that clearing a 40x100 yard in PA was beyond the battery life. It did not have enough velocity to move a pile of wet leaves from the 1 foot drainage ditch and blow them up the hill. Something the gas blowers will all do.
I also have 2 gas blowers, an Echo 210 gas blower and a Stihl BG86. The Echo outperforms both electrics with regard to run time 45 mins, and velocity (moving pebbles) but it falls short on volume (won't blow huge piles of leaves as well as the EGO). The Stihl BG86 has a modified muffler and simply outperforms everything. Blows out the hangar in 5 minutes.
I would choose the EGO 765 if I could do it over.
Just some nerdy information: The EGO 765 makes 24 newtons force on turbo. The Echo 9010 backpack blower makes 48 newtons. Despite EGO's bragging, it's half the power of a real backpack blower.