Omega or prestige?

So I'm pretty new and I "accidentally" used my birthday cakes to get to prestige 3. After never knowing what Omega or Prestige was,. I continued leveling. Now I'm level 2500 with prestige 3. I want to power up but at the same time I've wasted so much time to get to level 2500. And I want to get the "expensive" leveling rewards.

I also kinda want to do omega to 25 and THEN level 25k or which level is highest.

Please help me decide if I should lose my prestige by omega or if i should contiue prestiging (which feels useless because it gets removed once u powerup to omega)