With the SMD you throw the whole thing away and get a new one.
The UNO R3 can easily have the processor replaced if you damage it. With the SMD you throw the whole thing away and get a new one.
Another nice thing about the R3 having a socketed, and therefore replacable, main IC is that you can use R3 for initial sketch development, testing, and chip programing; then use the program chip on a custom PCB.
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