The thing I have noticed is that the Playstation controllers are perfect if you use them like a original Playstation controller: D Pad and buttons and triggers/bumpers. It is like they didn't want to mess with the layout when they added the analogue sticks, and that design decision has never been revised. Look at the Scuf designed PS4 high performance controller, not just one adapted from the Dualshock 4. It is laid out jsut like an Xbox controller, because that design is far more ergonomic.
I will say that the impulse triggers sound really cool and I am looking forward to trying one out.
I have an Xbox OneX and a PS4Pro. Thus, I will be getting both the next gen consoles. I will, however, be getting the Series X first. Playstation controllers are rubbish, ergonomically, and are generally light and flimsy. I much prefer the Xbox controller. And since Microsoft isn't making huge changes to an already fine controller, I wont have to replace my Elite v2 controller, which is a big plus, considering how expensive an equivalent controller from Astro or Scuf is for the PS4, or will be when you have to swap for whatever premium controller comes out for the PS5 down the road.
Go to any yard sale, thrift shop or surplus center and get an Optiplex 740-780 mini-tower for $5-10. Take that apart with him piece by piece (using the Dell service manual from their site) and explain what each bit is and does. Talk with him about the differences in parts, what to look for to see if a part is likely to work or not, the pros and cons of new parts vs used, anything important and relevant to each part as you go. After it's stripped down to a bare case, show him how to properly clean the system, get it shining and sparkly inside and out, then rebuild it with him from the ground up.
Once it's put back together and in great shape, test it with him. Show him how to use DBAN to properly wipe a hard drive he's just added, and the consequences of not wiping one (like having to sneak into an apartment complex's compactor at 2:00 AM to make sure that drive is well and truly buried and gone forever...long story). Show him how to SMART test the reformatted drive from a Linux USB, then how to use MemTest 86. Finally, install Windows if that's the OS of choice and install AIDA64 to put the whole system through a stress test. After it's tested, he'll have had the experience of breaking down, cleaning, prepping and rebuilding a PC from scratch and will be able to safely attempt it with a modern, more expensive system. Give him his "new" PC. That's the best first couple days of PC hardware enthusiasm one could ask for.