>>725475216
Depends on your choice of god.
Surrendering to Khorne will make you unreasonably, fuck-ass mad and murderous, but you will find fulfillment in the act of killing, so you are somewhat content. Downtime between battles is hell, though.
Tzeentch will seemingly give you what you've always wanted, but you can be sure that you will be fucked over ten times worse somewhere down the line. Do not trust the bird, ever.
Slaanesh is arguably the rawest deal of all, as you will be allowed to pursue whatever brings you pleasure, but like all addiction, you need an increasing dose of whatever it is that makes you feel good until you no longer get kicks out of anything. You'll be a husk that craves for sensation but there's none to be had.
Most mistakenly believe that Nurgle's is somehow a good deal, when the truth is that his is a forced servitude for 90% of the time, as his rot either kills you and turns your soul into a daemon in his service or you cave in and ask Nurgle for succor from the agony he himself inflicted upon you. It is recruitment by blackmail, and is endemic of Nurgle's entire ethos. He likes to keep up airs of being a loving father, but he is that in the most possessive and destructive manner.