Whole disk ZFS or -a4k partition

[Alexandr]

Hello, community!

I have a laptop with 2 disks - mSATA 32Gb SSD and 500Gb HDD. I plan to
use SSD as whole disk ZFS pool with root and /usr partitions and 500Gb
SATA as ZFS pool for /home and /var. My questions are:

1. Do I need to create a 4k aligned partition on HDD for zfs pool or
best to use a whole disk?
2. Where the best place for swap - ssd or hdd? SSD is much faster, but
with limited write life cycle.