For me it is not any one plant but several that do well in my set ups. Water spirit, rotala and Anubias. I also have a sword that did well in the 29 gallon but still waiting on it to come back after a major trim to decide if it is doing well in my 55.
What about you?

Water sprite for sure. I have a plant that has stalks that are at least 14-16 inches long.