PS4 9.00 User here, difference I can tell between Exfat hax and PPPwn so far is PPPwn seems more stable, With new C++ solution PPPwn is great stability, Jailbreak within 45 sec. I tested repeatedly 10 times, no more Kp or shutdown. Exfat hax...
My pro is on 9 and my phat release is on 11, I would say wait until the process has been ironed out. Just like past firmware, that first few months is porting tools and refining the jailbreak process. I can say I do like the 11 method over the 9...
I would say 5.05 is the one because after 6.xx stuff got fixed big time.
There may be better exploits for 5.05 coming, such as coldboot and more if anyone still cares?
AlAzif mentioned persistent HEN for 5.05 recently.
9.00 is best for pirates...
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi