Ooooh, Garmin Alpha--top of the line!
I have an older Dogtra 1700NCP I use with my 7.5 year old female Akita. She inherited it and a Garmin Astro 360 collar (DC40) from my previous Akita. My 11 month old male Akita pup sports a DC50 collar for the Astro and an E-Collar Technologies K9-800TS.
Like most Akitas they are not highly food motivated so the E-Collars help a lot with the off-lead training. But of course, as you know, you have to do everything on-lead first. It took both of them longer than my older dog to figure out the E-Collar but now they've got it wired
I thought about going for a two-dog setup but I decided I like having the two separate controllers so there is less chance of a mistake when working both at the same time. Also, the E-Collar Technologies folks are apparently a bunch of people that split off from Dogtra. I decided to try their product. I am finding the "funny" round controller to be very ergonomic.
Here's my young pup wearing his collars: