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kur0g4m1
According to some LN readers, there are a few characters and little bits of the story that were added/changed, but I don't think it's very different overall.
By "messy", did you mean the writing or the translation? The writing is fine for me, but the translation of the earlier chapters, Turb0translation's TLs, were somehow a little unpolished, I think. There's another guy, blastron, who does translation of the earlier chapters. It's cleaner, but it hasn't caught up to where turb0 stopped and where the the later translator, in Raising the Dead, started yet. Raising the Dead has neat translations, and they update quickly whenever there is a new raw chapter up.
The LN currently has 9 volumes in Japan. YenPress only has 3 volumes so far, though, so I guess you wouldn't be reading that far ahead of the manga, unless you know how to read Japanese.
In my opinion, reading the WN should be better if you're REALLY craving more of the story because you can readily read it after a bit of searching. The LN, unfortunately-- you have to actually buy it since you won't find any chapters anywhere on the internet. You can find illustrations from the LN, though.
I checked, and the last chapter where we've seen our spider MC is chapter 128 in the WN.
Have fun reading, if you do start!
