ssd to replace hdd in PS4 PRO / performance, models, reviews, is it worth it?

Good time. There is a question on the topic of replacing the standard hdd from ps4 pros with 1tb ssd. There are opinions that if you do this, then put it exclusively inside along with the ps4 system, but there are also opinions that if you take ssd to 4kuto exclusively external and transfer games to it and leave the system on hdd, since the system installed on the ssd along with the games will eat its resources leaving crumbs for other applications. I ask you to enlighten in this matter, who may have feedback on the use, about the speed in games, fps, friezes and everything in this direction. Thanks in advance.