If you also have an Air 1st Gen then:
my verdict for going from iPad Air to iPad Pro 10,5:
4 Speakers instead of one? Perfect (watching stuff in bed or on couch.....now with double the soundoutput as I sometimes tend to block the one speaker from the old iPad with my hand holding it.
4 GB instead of one measly GB shows. I did a test yesterday and I can juggle much more open safari tabs or open apps without them reloading/refreshing anew when switching back
GPU and CPU:
Uh no techhead so I can only quantify it as "snappy"? Probably should fire up Deathwatch Tyranid Invasion and XCOM:EW and see how fast they are booting but I already factory reset my iPad Air so I cannot make a side to side comparison.
Framerate/ Truetone display:
No opinion (yet)
For almost the same size and nearly the exact weight I get a bit more screen estate; as I am watching many foreign movies (japanese, spanish, french, etc) with subtitles turned on every pixel counts...especially if you are a half blind old duck like me. Also helpful for un-optimized game apps (or badly ported ones) with tiny text.
Why no 12,9 Pro? As I am commuting a lot and spend around 10-15 hours a week on my iPad AWAY from home I like the middle ground option more.
If I ever have the money (and desire) to have a powerful home-usage only iPad as well I might go for an big iPad Pro. As it is now the size is perfect.
Fingerprint scanner in homebutton:
Finally! I have one in my iPhone 6+ and more often than not I am dumbstruck why my iPad doesn't automatically unlock to my thumb
Going from 64 (iPad 3rd gen) to 128 (iPad Air 1st gen) to now 512 is.......awesome!
I don't sync often so I have a ton of stuff in my VLC player, Kindle Reader, iBooks (lots of scanned PDFs) Amazon Prime (whole TV Season) and a ginormous iTunes Libary.
Juggling the tons of games I want to play someday (maybe, hopefully) as well is a hazzle if some of the meatier ones are 1,2,3 GB in size.....having them around just in case isn't always an option...now it is
So for me the most important updates were Storage Space > Screen estate > 4 Speakers > RAM > CPU/GPU upgrade > Fingerprint Scanner > everything else
Yes it was expensive, but I use that damn thing 20-30 hours a week....so it IS worth my money.
My current iDevice setup:
iPad Mini (4th gen):
for mobility (rare occasions I have no Backpack when I am away from home) sometimes reading and legacy support (not planning to go iOS 11)
and ESPECIALLY old games with no Universal app with the old "1X 2X UI" for embiggening screen picture from iPhone size to iPad size.
Also playing games with old Digital Pad Setup (Secret of Mana, KEMCO RPGs nearly every oldschhool Premium RPG on iTunes) Twin Stick Shooters (Storm Casters Ultra) or otherwise unoptimized UIs unsuiting for mobile Action RPGs
feels way better on an iPad mini then a full sized one (try playing 3 hours Secret of mana straight with a normal iPad i dare you)
Telephoning and Web Browsing while commuting also Working (eMails) at work when I am in meetings or somehwere else on campus and not at my office pc.
iPad (Air 1st gen now Pro 10,5)
Primary gaming, reading, listening,watching and everything else device while commuting or in bed/ on couch
Yes I am an Apple nerd.....or not? Don't have a Apple TV or Apple Watch or even a Mac?