Florabase turned to mush after about one year and makes planting difficult becuase it's light weight. I've had several folks say this about it after awhile.
I'm not sure why folks have planting issues with flourite, I find it much easier to plant and keep the plants down using flourite/onyx sand. Flourite weighs a lot more and will never turn to mush.
If grain size is an issue, Onyx works great.
Both products will grow the plants well, but I like a heavier substrate material for pruning and planting, I've never had any issues planting fine small foreground plants with the SeaChem products, FB and EC are harder to keep the plants down till they root, both are much lighter weight.