Garmin only. If I didnt have midget dogs...I would run both.
do your midgets not go very deep? ive heard some can be as long range as a hound or cur.
I have two long range and two probably medium range midgets.

All will stay on a hog and have for 5 + miles.
I do my best to stay within range of my dogs. I have the magnetic antenna hooked up to one garmin on my ranger and the regular antenna (with the long range extended antenna as back up) hooked up to another Garmin.
Also have a 40" whip antenna as back up. If I get to a higher elevation I can usually pick up 2-3 miles. It has never been a problem but my area and terrain allows me to navigate pretty well and I do my best to stay as close as needed to my dogs.