The O'Days came with the wooden floor boards, but were removable. I think that touch went away when the DSII showed up, that is, DSI's made in that time didn't have the boards anymore. The boards look 'Yachty', keep your feet out of water that may accumulate over the course of a day's sailing, but other than that they are heavy (don't race with them) and require lots of upkeep(Buy stock in Spar varnish). (My opinion - use the wood for other applications.)
These Sailstars have a big air tank between the deck and the hull. If you have long legs, your knees will be in your face. I had the feeling of sailing on the boat, not in it. The air tank didn't help make it easier to right after a capcise, either. In fact, righting my Day Sailer was far less traumatic to than righting the sailstar I owned.
The Sailstars are pretty heavy and I think that they lack the subtle lines the Day Sailer has. For example, the Day Sailer has that nice curved transom, where as the Sailstar's is flat. The sailstar is a little bit bigger, too. By an inch or so. Guess I'm biased, but having owned both, I think I'm entitled to it.
Cheers,