one of the difficult decisions...when i started my planted tank i spent hours online reading about all the plants and after abt 6 months, im still learning...
depends on your substrate and your lighting conditions.
i have anubias petite and some weeping moss on bogwood....
love the fissiden fontanus attached to the bogwood...
for background i have baby tears and red lugwigia...ludwigia do grow really fast...needs regular pruning..