Realism Wrote:From my experience, just about any manga I read have the same difficulty level....doesn't matter what they're about. And I've read tons of them.
If this post reads disjointedly, it's because I was too lazy to rewrite the entire thing after realizing my entire post could be dismissed over the fact that it assumed you meant all manga are equally easy (which they aren't), instead of just having a smaller range of difficulty.
I'll agree that they don't have as wide of a difficulty spread as novels (mainly due to the fact that manga is mostly dialogue), but the range in the text's difficulty reflects the range of demographics: everyone from young children to twenty-somethings. The plot, vocabulary, and grammar generally get more complex and 'difficult' as the intended demographic's age increases.
So, something like 東京喰種 is more difficult (much more so, I'd say) than コイネコ (which I could read fairly early on), because of the vocabulary used.
Sure, manga, in general, have a smaller range of difficulty, but there are certainly ones that would be difficult for a beginner to understand, despite the images. In this case, the difference is having Core 2k and maybe half of 6k done and be able to read most everything without a dictionary, and looking up nearly every word in a dictionary and possibly a few grammar points.
On topic:
I'd say you should check out any manga that interest you and just see if you can read it (I'm sure you can find, uh, 'samples' if they're not available where you're shopping). Most of the series that are really popular outside of Japan aren't usually very difficult, so if you have any favorites that you haven't read in a while, you might start with those (personally, I find this a little boring, unless it's been a long time, but...)
And the target gender doesn't really say how easy or simple it'll be (though girls manga does usually deal with more 'mundane' situations (can you really call impossible romances 'mundane'?)), it's just a different set of tropes, so don't be bothered to choose one over the other for that reason.