I tend to agree that 'Wars' is simpler. I know it tends to make the Trekker sound like a snob to make that argument, but I really think that's what it is.
'Wars' is a fantasy epic that happens to be set in space. 'Trek' is a western that happens to be set in space, but which, beginning with TOS, had a lot of thought put into establishing a very realistic, well-thought-out and potentially plausible future universe - ultimately putting Trek into a harder 'scifi' category - which IMO became a strength rather than a weakness. I think this affects the accessibility of the two franchises, and therefore 'Wars' is more appealing to the general public because it is more easily accessible.
In some ways, 'Wars' appeals more directly emotionally, whereas 'Trek' (at its best, anyway) appeals intellectually.