For you who pocket carry the subcompact handguns, what pocket holster do you guys use do you prefer? A soft one or a Kydex pocket holster?

Get both! Try: https://www.blackhawk.com/holsters/tecgrip/tecgrip-formlok-iwb-moldable-holster/PG3211299.html
I carry a Kahr PM9 in one. (Can't remember which size, probably the "Size 1 Pocket Size Auto".)
Edit for pro tips: https://www.youtube.com/watch?v=t2wMfjC7-k8
You're welcome.

Don Hume is working for mine.

Sticky Holsters work well while wearing cargo shorts in the oppressive Florida heat. I carried a Shield 9 and then went to a 43X. Both carry well in my right front pocket.

I carry a G43 with TT+2 in a Recluse 2 sided cargo pocket holster... it has a "foot" that keeps the pistol upright, and a split down the spine to allow you to get a good grip while it is still in the holster... I wear mine in the cargo pocket of nylon fishing shorts.... they make one in a more triangular shape for regular pants pockets... at the time I got mine, the state of Florida has a pretty strict interpretation of what "concealed" was and the large footprint of the outer leather did a good job of keeping it from printing..

https://recluseholster.com/smith-wesson-shield-recluse-ts-cargo-pocket-holster

Desantis nemesis

Thanks

Where does one buy pants with pockets big enough to fit a Shield?

I can hardly get a G42 in my work pants.

Look at the products from Pocket Concealment Systems. Nicely made leather, well designed and practical.