SMART being ok means practically nothing. And Windows won't recognize Mac boot partitions, since they don't know the drive's HFS formatting.
Put the SSD back into your Mac. Download a HDD diagnostic (Drive Fitness Test or SeaTools are both good) and burn it to a disk. Boot said disk on your Mac and run the long test. If it passes, you should be in good shape. If it fails, then yeah, your drive is borked.