The only partition boundary that matters in a SSD is the location (address) of the beginning of a partition, which should be a location or address that is evenly divisible by four. That is otherwise known as partition alignment. Unaligned partitions cause a SSD to have slower write speeds, as it tries to compensate for the bad alignment inflicted upon it by the file system.
Unfortunately, we still (must) use file systems designed for HDDs, that are not optimal for SSDs. All the structures like tracks, sectors, and cylinders for HDDs don't apply to SSDs. SSDs are organized into pages, blocks, and planes (like a geometric plane), and apparently a file system designed with those structures in mind would be more efficient for SSDs.
Actually, the more OP space a SSD has, the better for long term performance. But that also depends on the usage of the SSD. For example, enterprise SSDs have much more factory OP space (meaning not accessible to the user) than consumer SSDs. Intel's latest enterprise SSD, the S3700, has 120GB of OP space, for the 200GB of user space model.
You'll commonly see consumer SSDs with capacities of 60GB or 64GB, 120GB or 128GB, 240GB or 256GB, and 480GB or 512GB. Each pair of SSDs (120GB or 128GB for example) actually have the identical amount of NAND chip space on them, but the lower capacity SSDs have that "missing" space set aside as factory OP. SandForce controllers have two options that may be used with the factory OP space, and until recently required the SSD manufacture using that controller to always have the higher factory OP.