I have had good results with the PF. If you have the correct size cap and the vacuum is working you should not slip. The LG sleeve will give you a good seal for the vacuum and will last a long time. I recommend wearing the glans cap and using some powder on the cap.
But as everyone says, you must be patient and persistent. It takes time.
There are lots of PF users and many threads regarding PF on this forum and others.
I have no experience with QEP, X4 or Restorexx. I am sure members have had success with all of them. If you do a search on this forum you will find lots of information. That will be very helpful.
There is no one “best” extender.
By the way, since you seem concerned about whether you can gain the 1-2” and want some more inspiration search for user bennett8, who gained 2 inches with manual PE. Of course, most people do not gain 2”. But, it does happen.
Whatever method you choose you should gain if you stick with it.
Good luck.
What do you use? I’ve been having nothing but issues with my phallosan forte between slipping out and hurting my dick. So I have the lghanger sleeve on the way to try. But I have quick extender pro on the way here. On a different forum I saw the gains a couple members got from QEP. I used to have an x4labs but I lost it and remember slipping out of that too.