Garmin is way easier to use out of the box. I just bought the garmin ultra 122 with gt56 ducer. Had it out yesterday for 1st time and it was awesome. Search MG marine tech on YouTube and see what you think.
I have had the helix 10 mega si and it was outstanding. But I wanted garmin to go with my Force. I love the Go To option when linked. Find the brush pile and drop the trolling motor and it takes you right to the spot you marked on SI.
Lowrance and HB will have a higher leaning curve. Do you have a trolling motor with spot lock you want to link?