It would be nice if you were to describe those options. Farrowing crates always worked for me.
Faorrowing Crates have been in use for years.
Even loose, most of the litter will get crushed if the Sow is left to run free with them.
We’d have a sow in a square pen with plenty of room for mom and kiddos to move around, which was the better part of it, but also a small wooden railing that stuck out a few inches along the pen walls just a little higher up than the standing piglets, so they could easily scoot or snooze or whatever underneath it.