I would go with the Samsung. An SSD has many advantages over a HDD.
Faster, quieter, cooler, less power needed....
Should be fairly straightforward to clone the Toshiba to the Samsung Evo.
Just preserve the Toshiba drive intact until you are certain that the SSD is fully operational. And even then keep the Toshiba for awhile longer before repurposing it.
And, as always, be sure that all data is backed up, in duplicate, and verified as readable/recoverable.