Buddy has Elite 5, I have the HDS. The screen resolution is a little better with the HDS. Sonar returns a little stronger and more separated. HDS is "high def" sonar which in practice actually has more power even though the ratings look much different.
Either one is great. As to how much difference, I would say you get about a 10-20% increase in overall performance with the HDS. If you know your stuff it might make a difference. For me, being pretty much a sonar novice, I don't think it matters much. If I did it again I would get the Elite 5 and save a couple hundred. Not that I don't like the HDS!
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