They were likely actually referring to MLC vs TLC vs QLC. All three types can be manufactured in the stacked "3D" form.
MLC stores 2 bits per cell, TLC store 3, and QLC stores 4. MLC is the fastest and most reliable form, while QLC is the cheapest.
The MacBook Pro likely uses TLC like the vast majority of current consumer machines. Apple's SSDs are typically among the fastest available, but I haven't been able to find anything about reliability.
MLC stores 2 bits per cell, TLC store 3, and QLC stores 4. MLC is the fastest and most reliable form, while QLC is the cheapest.
The MacBook Pro likely uses TLC like the vast majority of current consumer machines. Apple's SSDs are typically among the fastest available, but I haven't been able to find anything about reliability.