CDTV was simply a bit early (hence the price) and a bit confused about what it wanted to be. It cost like a development machine but it was a fundamentally end-user one; it provided continuity for Amiga developers but only a hard reset for Amiga users. It also debuted in harsh economic times.
Playstation was a $350/$299 toy with a computing power delivering 3D experience only available in top end Arcades a year prior (Namco System 22). 60fps 3D gaming plus 320x240@30Hz ~MJPEG video playback. You couldnt buy anything with similar 3d power for a couple of years, closest would be $3000 top of the line 1997 PC (P200, dx5/glide).
But at the end of the day it really didn't matter. I remember seeing a CDTV at a store and it wasn't even in the computer section. It was in the stereo department sitting in the middle of the sales floor in just a stack of boxes. You had to know what it was all about when you saw it. The sales guys didn't know what to do with it, sadly.
Not a single technical improvement, hardly any non cost reduction difference between them. Would be like arguing breadbin vs C64c are different computers so cant call C64c 1982 tech.