Data in input and output transactions are quite different because:

input transaction data can only be added by the miner who obtained the block.
Input script transactions can only contain arbitrary data when they are made by miners that obtained the block.
Therefore, except at the very early beginnings when random individuals could still mine without having a nuclear power station at their disposal, basically all input script transactions are boring ads made by mining pools or other souless companies.
As a result, inputs contain almost exclusively boring miner advertisements.
output transaction data however can be added by anyone who makes a transaction.
Therefore, although the large majority of it is also crap and spam like the rest of the Internet, there is much more interesting stuff to be found there in total.

Here are some exceptionally interesting input data that are not mentioned in other sections:

tx 61e26d407c17e8ee33a8b166c78f78c53cdcdc0078ae1f9405e6583cfb90eaf4 has an is exceptionally cute miner message:
I should not run the washing machine while listening to WZBC. I managed to convince myself that the machine was slowly failing -- that a rythmic, squeaking noise it had been making had gotten a little worse. Ten minutes later, though, the machine had paused. But the noise was still there.
Feels like a Koan.
tx 15b11e8d4e5b9425f024b381ba0cb7a54a35e52389bb4855f505772ce685b39c: Rickrolling lyrics were mined several times starting with this block, see also: Rickrolling
tx 24e137d5b478d9a8b947e4f3f6130a86f2e0f6a2dda1cac1373b485c577f8ba7: www.cs.brandeis.edu/~hornby/amuse/vs_toast.txt: "Once upon a time, in a kingdom not far from here" Electrical Engineer vs Software Developer tale. Possible original: www.cs.brandeis.edu/~hornby/amuse/vs_toast.txt
tx e450166eba552202fb6984867f2b851e2399c5a0ae05026bf6b056176491ec5d: "Here are some of the reasons why Tau is better than Pi as a universal constant for circles."
tx e2c20c2977589240ad9486672a0273d340ed5f8b50a50071716d12035d7212e8: has a large Lorem ipsum

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