diskutility in 10.13 does no longer allow to format new volumes using HFS+.
but you can reenable that for specific volumes.
1. go to diskutility, choose the disc or volume you want to format, go to reformat page.
2. note down the identifier of the disk in question (diskxxxx)
3. go to terminal and type:
user$ diskutil apfs deleteContainer diskxxxx
diskutility will now show all four old options, HFS+ with or without journalling and with or without encryption, in the menu and you can select one of them (probably without encryption for MacOS9/PPC) and format the volume.