lily, ... No. No float unit has priority in Phase II. There is no priority for exactly what you own - even for reservations in your home season. You can state a preference for a corner small (Deluxe) 1-br, but that only means that the resort staff will try to honor it - as they do with the numerous requests for a preference.
People arguing with the front desk about where they will be makes check in a chore at Harborside. It's not a pretty sight and makes for long lines as people will not accept that the staff has done its best to accommodate all preference requests. (It helps to be 5 Star. I can often check in early and miss the unpleasant sideshow.)
If you want priority at Harborside, buy and use a fixed unit.
Moreover, I do not believe many corner 1-br Deluxe units in Phase II were sold all by themselves. Most are part of 3-br lockoff units. Almost all of them were sold as 3-br units. And, they are usually reserved as 3-br units (although I have dropped the 2-br non-lockoff portion after making my 3-br Platinum reservation and I ended up with a corner 1-br).
The Phase II corner Deluxe 1-brs that are part of a designated 2-br lockoff all have Courtyard or Promenade views anyway.
Go to Harborside to enjoy the amenities of Atlantis and the resort. Views are not that important there.
(You could state a preferance for something in Phase I, if anything is available. But it's hit or miss there, too, as to what type of view you will end up with. In general, the views in Phase I are better than the views in Phase II. However, most fixed units in Phase I are not turned back in and, until the renovation is completed, you could end up in a unit with "tired" furnishings.)
Buying a 3-br in Platinum (high) season would give anyone the ability to have a pretty good chance for a good view over the pool or water. With the 196,900 StarOptions, you are able to reserve a 3-br in any season. But, buying a resale 3-br in Platinum season is still pretty expensive. There is one currently on eBay for $45,000 - but it's overpriced and won't sell for that. ... eom