Complete Wetsuit Vs Separate Pars

Hey everybody,
So, I was wondering about the difference between wearing a one piece wetsuit (let's say long sleeve and long pants) vs wearing both parts separately. Here in Rio water temperatures range from 20 - 28 ÂșC ( I agues 68 - 82 Fahrenheit) so I'm not sure how the separate parts would work in Winter, but for the above mentioned range of degrees, do you guys believe it makes sense having a set of pieces instead of a complete suit, or does the fact that they are a one piece thing makes it a whole lot diffent.
Thanks!
So, I was wondering about the difference between wearing a one piece wetsuit (let's say long sleeve and long pants) vs wearing both parts separately. Here in Rio water temperatures range from 20 - 28 ÂșC ( I agues 68 - 82 Fahrenheit) so I'm not sure how the separate parts would work in Winter, but for the above mentioned range of degrees, do you guys believe it makes sense having a set of pieces instead of a complete suit, or does the fact that they are a one piece thing makes it a whole lot diffent.
Thanks!