First timers should always try the original first
Whenever my friends are going to try Buldak for the first time, they always choose carbonara because it's popular. But I think it's really on preference because some of them don't like it and then they would think all of the flavor are bad after trying and would miss out on flavors they might actually enjoy.
So I'm saying if you want someone to try it, tell them to try the og first until trying anything else.