If you would ever sail the boat with a chute buy the N20. If you will never sail the N20 with a chute then buy the 6.0. I dont think the n20 is much fun without the chute. The 6.0 is still very powerful downwind without a chute.

Ive sailed both a bunch. The N20 is a really fun boat. They are both a handfull. I might actually recommend an TheMightyHobie18 for your needs.