what phone company is easier to switch to straight talk

I want to buy a galaxy S6 edge plus and switch it to straight-talk but I don't know if this will work or what phone company to buy from. I want to know if it will be easier to buy it from Verizon since straight-talk runs off Verizon towers. or at&t of T-mobile I plan on buying it from best buy any help would be amazing. Thank you in advance.

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