If you are planning on going to HS anyway, I would stick with H&V. As for needing a full day, I would say yes for 3 reasons 1) there are a lot of shows which are only starting at certain times and take longer so it took a whole day to get them in. 2) we spent a good deal of time on character meet and greets including sully and mike (monsters inc), Ralph and Venollope, Mr. Incredible, Santa Goofy, and Phenous and Pherb, Mater and Lightning. 3) We did lunch at H&V and it was great, we did a later lunch like 130 and were able to meet characters multiple times and did several dance sessions...probably one of the longest TS meals we had the whole trip.