Mushoku Tensei: Isekai Ittara Honki Dasu, Princess wa Barairo no Yume wo Miru Recommendations
Both series feature the main character reincarnating into a fantasy world.
However, while in Mushoku the character goes through the actual reincarnation process: where he comes back to life as a baby… In Princess the main character just awoke as the game character he created for a MMORPG.
Also, in Mushoku, you will see the MC working hard to become a good person (since he was a NEET in his previous life). While in Princess the hardworking MC (a male) awokes in this fantasy world as a vampire princess with a whole country for himself/herself after dying in Japan.
The last differences goes in the prespective: Mushoku is