Welcome to MTBNJ!
For the last ten years the tall boy has been the #1 seller for SC. This year the Hightower became their #1 seller. It offers a bit more travel with a minimal weight penalty.
If you want to race XC or ride with guys who do, i'd recommend the TB3. (likely in 29er). If you are less interested in speed and more with traction, io'd go 27+. If you care more about the Dh's than the speed of climbing, i'd go Hightower (and then pick a wheels size)
We have both the Hightower and Tallboy available for demo. There is no substitute for riding a demo bike on trail you already know.
The Hightower only comes in carbon while the TB3 comes in both alloy and Carbon. (carbon is way stronger as well as lighter)
I personally chose the Hightower in 27+ and I love it in all conditions. I will conceed that I give up some straightline speed for the bgger wheels, but after riding both wheelsizes, the 27+ spoke to me.
The new rule in bikes is to pick a wheel/tire size and then be a Dick about it.
Take note of the SC warranty:
https://www.santacruzbicycles.com/en-US/warranties
They are making their bikes to last. They are NOT the lightest by any stretch. They may in fact be among the toughest.
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