Righteous fire build in 3.0: Templar vs Marauder

Hey guys!

I am finally coming back to poe in 3.0 from a long break and I want to play a righteous fire build with either Marauder or Templar. I've seen both versions in guides but I wonder: Which one is actually the "better" one as a league starter in 3.0 in terms of gear needed ecetera?

Any advice from beta RF players is very appreciated. Also, how would you level such a build? I dont want to RACE through the content, but still want to arrive at end game quite quickly. Can you transition into RF early or do I have to play totems / sunder / w.e. until I am atleast 60 with maxed fire res?