Dual vs Single SATA Docking Station, for Clonging

I am thinking about getting a docking station. But I am a little confused on what the advantages or disadvantages or using either. Or should I just stick with using my software?
 
I have a copy station which takes two hard drives and have found it easy to use and reliable. The only drawback I've noticed concerns the relative sizes of the two drives. There's no problem copying from a small hard drive to a larger or equal sized SSD drive. You can then use software to rearrange and resize partitions. However, if you have a large hard drive and want to copy to a smaller SSD drive it's not possible. Mind you it is a few years since I bought my copy station so that may have changed.
 
Good docks will clone the HDD's without the presence of a PC. Otherwise, you'll just have access to two disks from the one USB connection ..
 
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