Sort of depends on methods used to scape and plant.
Each takes some getting use to get the most out of it.
I like the ADA AS.
And flourite.
EC nice because no washing, but is lighter weight than flourite Black.
I have a large amount of Black flourite and sand. This is very nice and has a good color like EC. You have more consistent grain size and it's heavier(maybe 2x). It has two sizes: gravel(like plain flourite) and sand which is a bit larger than Onyx sand, which is just right.
Trade off?
You have to rinse it, there's some tricks that make life easier there though.
EC you pay more and you pay to ship water, always a bad idea, we can rinse, it's not that huge of deal.
Aesthetics, you could have argued in the past for EC, but not now.
Regards,
Tom Barr