Silvinia Natans are my personal choice of decent floating plant.
Of course there are other options, Duckweed but this can be difficult to remove if you no longer want these in your tank as you have to remove every single piece of duckweed.
Water lettuce, Frogbit, and even some stem plants can be used as floating plants, such as hornwort and elodea.
I've used elodea as floating plant before, quite liked that actually.
So there are several choices and probably a lot more if you research a little online but these are what I remember for the moment.