The 93s are very good units, but the guys with enough bucks claim the bigger screens are better for LS. I have two 93s on the bow, one for LS one for down image, a quirk of mine like the reassurance of the sonar to verify what I have seen LS. Had a bird 998 up there it quit missed it so replaced with a 93. Have not tried the SI on the Garmin, have a old HB 1197 at the console that is my go too navigation and SI unit, linked to a HB798 that is map only on the bow. I have never had much success with SI on the trolling motor, but that is my deficiency. A good TM with spot lock is great also, I am running a ULTREX, but hear good things about the Garmin, some folks really like the TM linked to the electronics I have personally never figured out how to make it work, likely my lack of knowledge, been thinking of hiring a guide to see how they use it. Which may be a good idea for you, to see equipment in action. Last, keep reading, do not be afraid to play with your settings, spent a full day never fished just messed with settings, you can always put them back. Different conditions require different settings, sun, water clarity etc. have my bow units mounted high so constantly adjusting, depth, how far front etc. tight lines and best of luck
one more thing, see lots of folks have battery issues running LS, many over look that the black box is a constant drain, the manual says to disconnect between use, wired mine to 20v dewalt tool batteries that I pull at the end of the day. Lots of info on here Ricky is a HB wizard in this forum.
And welcome to Crappie.com you are in a Great place for help.