1.8 vs 1.6 debate help.

I’ve had 3 Miata, two 1.6 and a 1.8 I turbod both my 1.6. Currently have a stock bottom end 90’ turbo 1.6, roughly 250 wheel. It’s got a Nb 5 speed attached All the goodies etc. I know these 1.6 pretty well, but I don’t know the 1.8 at all. I have a spare long nose 1.6 that I want to build, looking for around 450 wheel, I’m going to probably do a 6 speed swap as well. But I just really don’t want to go an do a whole 1.8 swap. I understand there are drawbacks with a 1.6. But I don’t see the necessity with going 1.8. I’m already going to be 5k into the motor. Let me know your opinions here!