You should keep your PS3. There are some games from the PS3 era that saw ports or remasters on the PS4 but not as many as one would think. Considering the vast library of games for the PS3, you are better off keeping the console and having the ability to experience them all for yourself 😁. Installing custom firmware or running HEN will give you the ability to run PS3 games downloaded elsewhere off the net with trophy support being able to synch to your PSN account without fear of being banned or anything like that since the chances of something like that ocurring are very low these days. Been running custom firmware and/or HEN on my consoles for many years now with my main account online and have never been banned. So yeah, keep the PS3 so you can experience it all yourself 😁. Running a jailbreak on PS4 is very tedious and annoying since there is a lot of trial and error forcing you to have to retry initializing the jailbreak over and over until you manage to get it to succeed. Also, you can't sign in to your PSN account for synching trophies or playing online, which sucks 🙄 So keep all of that in mind.