Manga 70261 Mushoku Tensei Isekai Ittara Honki Dasu Userrecs

In both novels the MC is transported/reincarnated to another world. Both the worlds are like games and have magic and fighting. If you like funny, game-like worlds then I'd definitely recommend you read both. 

Both are pretty funny but this one is funnier. They go to different worlds and use the knowledge of their previous live to sort situations. Great both works. kind of greedy each MC and with similar set of values.  

Both are an isekai harem where the mc is somewhat overpowered. They also both have "labyrinths", monsters to fight, and magic. Mushoku Tensei is like a toned-down version of Arifureta with fewer women and a less op main character. 

Both of Novels are superbly similar because both of main character were killed in the previous life and "incarnated" to the new Magic world. Both of them also wield unusual magic  

Both really make you feel like you are living in the world. Both MCs reincarnate with all there memories intact finding they are inhabiting a fantasy world. Both find they are rather OP for this world except one a bit more so than the other. They both also use there knowledge from there previous life to help them in this fantasy world. Finally both change, living a much different life in the new one they have been given however while both have good intentions one changes for the better and the other. For much much worse.