Has anyone read ラメーン赤猫 or コンビニ人間?

I'm around N3 level (currently studying for the N2) and have both of these books (among others) and am trying to decide which to read.

It's a big time commitment for me since I've never read a full novel in Japanese before (just manga), so before I commit to one I was interested to know if anyone else had read one of these and have an opinion on which to start with.

Looking for a combination of ease of reading and opportunity to push myself and learn new things.

I assume I'll be spending a lot of time, at first, looking things up in a dictionary, but would ideally love to avoid too much strange language or grammar that aren't widely used since that wouldn't be the best use of my time.

Thanks