I just converted from your second option to your first.
When I built system in 2016, NVMe drives were expensive, so I used a 250GB M.2 SATA drive & 1TB HDD. I do not have Windows but put (now) two Ubuntu installs, 16.04 & 18.04 on SATA drive and space for booting install ISO directly. Then also had large amount unallocated. HDD had large /data partition but for me large is 100 to 200GB as I do not have much media.
So I upgraded to a new NVMe drive with Ubuntu, ISOs & data with still room for more installs & unallocated. And then HDD is mostly for backup, and test installs just to experiment with something.
I also moved SATA drive to a M.2 USB adapter. Becomes bit larger, but faster flash drive.
My sda is USB M.2 drive, sdb is HDD and sdc is a flash drive. NVMe drive is now main install.
Code:
fred@fred-Z170N-focal:~$ lsblk -o name,fstype,size,label,partlabel,mountpoint
NAME FSTYPE SIZE LABEL PARTLABEL MOUNTPOINT
sda 232.9G
├─sda1 vfat 49.8G ESP ESP
├─sda2 ext4 30.3G xenial xenial
├─sda3 ext4 20.5G ISO ISO /media/fred/ISO
└─sda4 ext4 25.4G bionic bionic /media/fred/bionic
sdb 931.5G
├─sdb1 vfat 510.2M ESP_B EFI System Partition
├─sdb2 ext4 30.3G bionic_b bionic_b
├─sdb3 ext4 49.8G ISO_b ISO_b
├─sdb4 ext4 147.6G backup_b backup_b /media/fred/backup_b
├─sdb5 ext4 30.3G focal_b focal_b
├─sdb6 ext4 302.8G data data
├─sdb7 swap 2.1G
├─sdb8 ext4 24.4G disco disco
└─sdb9 ext4 24G eoan eoan
sdc 28.9G
├─sdc1 vfat 4.7G ESP_32GB ESP_32GB /media/fred/ESP_32GB
└─sdc4 ext4 14.7G data32 data32 /media/fred/data32
nvme0n1 465.8G
├─nvme0n1p1 vfat 512M ESP_NVME esp_nvme /boot/efi
├─nvme0n1p2 ext4 29.3G focal_0 focal_0 /
├─nvme0n1p3 ext4 29.3G
├─nvme0n1p4 ext4 29.3G
└─nvme0n1p5 ext4 195.3G nvme_data nvme_data /mnt/data
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