I just bought a fixed week/ fixed unit. This is unusual because my first time share was in 1985 and was a fixed week and fixed unit. The week was nothing special but it was available the second week in April in Hawaii. So naturally, I thought of all the benefits like a fixed week of vacation every year. Easy to know when I went to Hawaii. Couple years later I got a Marriot floating week and suddenly I loved the freedom and flexibility to travel in different weeks.
Recently, I found a ts building in which each of the corner units had a balcony that wrapped around the corner so your bedroom had double balconies and great views. Only 2 per floor faced the golf course and the ocean, so I naturally would not enjoy any other unit and I was picky about my week of travel.
Moral of the story, I own and enjoy a floating TS, a fixed week TS and a Fixed Week and Fixed unit. That is why all the timeshare companies charge more for fixed weeks like Xmas and New Years, and I most tuggers do not own those weeks, but most of us would exchange or trade for them.