WRB, my/our generation is why they still have a flasher display in these high dollar LCD units today. 

It wasn't until several years ago, when I went with the Lowrance HDS system that I took the flasher out of my console in installed the HDS-5, because it had mapping

I haven't done the research or testing these newer graphing units but the it wasn't that long ago, if you was running 40-50 mph down the lake, by the time the graphing unit got it on the screen, it could be a long way behind you, if it would even show anything at all.   

The Lowrance flasher I had in mounted in the center of my instrument panel would still give me a fairly accurate bottom depth track up to about 60 mph, the early graphs would quite giving bottom track at 20-25.   If you knew how to read the flasher, which after 50 years of using one, I didn't have a problem with that, they still give you a very accurate presentation of what under the boat, it just does not have a history past the initial target contact like the LCD units do, so if you are not looking at it, you will miss it.  With the LCD, you can just glance down at it from time to time and see what you missed.

 

The Helix is out! ?

 

 

For me SI

A lot of guys idle around and watch the SI at the console for spots. I do this some. But mostly I’m at the bow casting, slow trolling and watching the SI at the bow. SI at the bow is very helpful for circling a possible target while casting to it also.

I don’t have 360 imaging. Just hard for me to drop 1200$ on a transducer with NO head unit.

SI and 2d is what I always use. Never cared for DI

SI and rarely use my DI but often use the 2d.  

Map, DI, SI in that order for me....in a kayak