Lowrance or Hummingbird ? Which one should I buy?

[Alexallen]

I currently have one Lowrance HDS7 Gen3 on the console but I need at least one more fish finder up at the bow. I am still learning the fish finders and I do not mind either of both fishfinder brands but not sure what fish finder and what size to buy. Any suggestions would be helpful.
Whether you know the way to interpret a finder screen, there is no need to be ashamed. There are many anglers who are very experienced but they have never seen a finder in their entire life, especially the ones with sonar technology. Reading a fish finder could be complex, but it is very crucial to know this before you buy one.
Some reference source I found, there are quite a lot of useful information, hope to help people with the same problem with me:
https://www.youtube.com/watch?v=s2gXKF3LD-4
https://fishfinderbrand.com