Dual-SIM Or Single Sim Smartphone Which Do You Prefer

For most people when buying a smartphone sim contact is one features they always check especially since the introduction of dual-SIM smartphones.
While some don't bother if they phone they purchasing have dual-SIM or not.
Some will say dual-SIM is a lot better if you have many or two sim cards or a business person and to be swapping Sims is very difficult for them while some will say

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