Depends on condition; the red root floaters in my 5 gallon have to be disposed of about once every 2 weeks (i dispose of 1/2 to keep them from clogging the top). I think i like frogbit the best of the floaters i have used but red root isnt' bad; it does produce a lot of little white flowers...Small floating plants like duckweed can get sucked into your filter, although if you don’t want a full floating plant mass don’t choose duckweed ! It has it uses but the stuff over takes everything and reproduces so fast.
Red root floaters are pretty and are slower spreading.
Water lettuce is my favourite but doesn’t do well in strong flow in my experience , it has longer, bushier roots so that’s your choice to decide if you like that look or not , or if it’s a good fit to your tank as I know you asked about a power head.
Of course you can use the method recommended above where you make a ‘ring’ to corral your floaters to a specific space with air line tubing or similar to keep them in the space you want them to be.