Install image from asterisk site vs image from freepbx site?

we need to upgrade our freepbx/asterisk server in a lab/educational environment.
i’d be happy to hear opinions of whether we should start w/ the
AsteriskNOW-612-current-64
or
FreePBX-64bit-6.12.65

images.

i understand that they’re extremely similar, but not identical. it will be used in a lab for a VOIP
course in an MS program in Networking/Communications.
tnx,
ams