If your wanting to create your own maps, get the striker, nothing extra is needed. It can record up to 2 million acres. Ive mapped one 500 acre lake, and about 200 acres of a different lake. I think it's very useful.
With the helix, you have to buy a $100 zero lines card, to do your own mapping.
The downside to the striker is, no microsd card slot. It has a basemap with GPS.
As for the image quality between the two brands, that's a topic as debatable as Chevy vs Ford. Look at some of the images I posted on the side imaging sub-forum. And I'm a rookie.
I have echomap plus units, love them.
The striker uses the same transducer, and has the same pixel count as the echomap.
I'd recommend either stepping up to the echomap plus, if you want touch, or get a echomap chirp unit.
Here's a 93sv chirp -
https://www.basspro.com/shop/en/Garm...LakeVu-HD-Maps
For a $100 more than a striker plus 7 sv.