Quote Originally Posted by David75 View Post
The main difference, after ep1, is that Rimuru had a very easy and full of OP level-ups cave because/thanks to Veldora.
Yes. That IS the difference. Rimuru was essentially invincible by the end of the first episode.

Hopefully Spider takes a much longer time to get that way, if ever. Because that's the point when the story no longer matters, and you're JUST a gag series after that.