this is a simple question. the invaders, are softer, thinner(i think, at least compared to wides) and park oriented. they might be a bit lighter too. the chronics, are mnuch more stiff, larger, heavier and much more park oriented. however, many people use the chronic and chronic wide as a park ski. in conclusion if you want all mountain get chronic and if you want park/butters get invaders but chronics will work in park too, just a bit stiffer. however, i think that if you get chronic get chronic wide because they are just so much more fun and cool. width always makes it funner all mountain and also more stable for landings.