I have taken both. Both are great. Both are VERY different. BSM is a full day tour, Yuletide is about 3 hours. I did BSM as my first tour and enjoyed it so much I have taken 9 additional tours over the years since, including Yule. If you are looking for a more indepth park experience, BSM. If you are looking for some park, some resort, Yule.
Mkae sure you get any discounts that apply to you, DVC, AP, Disney Visa, I think AAA also.
I asked this same question a few years ago because I was going in December and was trying to decide which tour to take. We decided on the Yuletide because it is only offered during the holidays. We are finally getting to take the BSM next month.
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