Win7 32bit or 64bit for ssd?

64 bit.

There is no difference between the two in terms of working with SSDs (both work great), but the 64bit version will allow you to address more than 4GB of total memory.
 
Unless you have a specific reason to stay with 32-bit, go with 64-bit. There'll be no more Windows OSs in 32-bit form anyway so you might as well make the switch.
 
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