rossyt99 - plants will last as long as you look after them, the substrate will make no difference, providing you have easy to care for plants like below then they will survive, If you have bought plants that need co2, high lighting, heavy fertilisation or some that need additional NPK they they will die, plants that are often sold may not be aquatic either.
A.swords are heavy root feeders, you can supplement them by root tabs, or a nutritious substrate, sand traps waste on the top but in gravel the waste can fall through the gaps providing a small amount of nutrients, I have an inert gravel substrate and the swords are not to bad but in my sand tank, i have JBL substrate fertiliser and they are extremely healthy, they constantly reproduce. it is surprising the differece it makes!
i have a planted tank with sand, some easy plants aswell -
anubias
vallis
elodea/ egeria densa
java fern
Cryptocorynes
Mosses