Shadow Monk 8 or Monk 5 / Gloomstaker Ranger 3 or something else?

Hi!

I'm currently having a lot of fun playing a level 5 shadow monk and my party just hit level 6. The campaing probably won't reach T3, so I'm in doubt about going monk all the way through or going Ranger 3 to get Gloomstalker.

What option do you think is more fun? I'm open to other suggestions aswell.