Logistically,

Are you going to scape once or do you like to move plants around? ADA AS vs Eco.

Single layer substrates work well in the long run, multiple layers tend to mix over time.

Agreed that fancy subs aren't needed(3 tanks running on chick grit alone, no under layer) I do see a slight advantage in Fluorite and Eco as less compacting and easier plant uprooting. I have ADA AS but haven't used it yet.

No matter, shipping is high on heavy items and won't come down soon.

Mabuhay!

For me, if money is not a problem i would go for the top most or the most expensive substrate to check if it will deliver what it says it will deliver.

Godbless everyone