Formatting the drive (not quick format, but regular) is as good an erase as any. A 'secure' erase usually concerns HDD's and it means resetting the sectors a number of times with different values to deter any data recovery. It's all a matter of privacy. Regarding SSD performance, no erase will help, be it secure or not. SSD's have a wear leveling algorithm that is responsible for extending disk life, and also for performance deterioration, and that cannot be reset. All you'll achieve with an erase is shortening the life of the SSD by 2-4 write cycles for a format, or 6+ for a "secure" erase, of the total of (advertised) 100,000. So, if privacy is not the issue, go with a quick format and save the effort.