Do you want the pot to reflect seasonality of the tree in a particular time of year ?
For winter display you can go in a direction of complementing the white bark for a softer impression or contrasting the light bark for a more powerful impression:
High contrast pot for winter display:
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Softer/Harmonious Pot Selection for Winter display:
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If you want to display the tree in leaf I think softer is better in terms of color so that you don't compete with the vibrant foliage:
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Overall for me, a very light blue or soft white rectangle would give lots of flexibility on displays