Those speakers pack a good amount of bass and surround sound too. I feel they are much improved over the 9.7 Pro.
They are virtually the same, I have both and cannot tell the difference. I can instead tell a clear difference with the 1st gen 12.9, clearly more powerful speakers... (I can also tell the difference with the 11in ipad, and I find it slightly worse than the 9.7 and 10.5, not a big difference, but not hard to notice side by side, contrary to the 9.7 vs 10.5, which sound the same).
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I went with the 10.5 pro, main reason was the speakers. I don’t care about promotion, makes no difference to me, but some people live and die by it, so to each its own...
White spot is annoying, the only solution is using dark mode all the time, but of course it won’t make white web pages or word documents dark... so you will see it...
Speed difference is kind of noticeable (I have a mini 5) but not a big deal... As for RAM the more, the better. But as I have explained elsewhere, the difference between 2 and 3 GB is huge, the difference between 3 and 4 is much less in ios 12/13 (it’s like having 16GB storage with the OS taking half of it, you only have 8... and having 32 with the OS taking 8, you have actually 24 (3 times more). Adding 16GB more is nice, but in day to day it’s not like moving from 8 to 24 which changes your life, hope the comparison is clear...)
Honestly there is no clear answer, I chose the speakers over the white spot, but I am annoyed by it, but I would make the same choice again because of it, as I watch a lot of youtube with my ipads so I need loud speakers especially in the kitchen...
One last thing, if you use airpods you’ll have a much better range with the air 3 because of bluetooth 5.0