g'day all, and welcome to the new members
apart from the OP there are a dozen (now 13) contributors to this thread, but only 3 votes.
this is a survey or poll, with only 2 choices - xubuntu and zorin. if you are going to contribute, please do the OP the courtesy of voting.
given the OP has said at #5 that he has installation media ready, then suggesting other linux distros is academic, although i personally value and use a number of your suggested distros.
i run 70 to 100 linux at a time, for those new.
1. a survey should have a cutoff date. for example 2 weeks, 1 month, according to your needs. otherwise people will still be voting in 2 years and you have lost interest or gone to another forum.
if you cannot change that, arochester or i can, give us a figure.
2. you mention in #1 zorin 12, but 15 in the poll. do we take it, it is 15?
3. if you wish to entertain other options, place a 3rd option "other - please specify" - again, we can change that if you cannot.
3.a - if you go with the above, tell us the requirement figures you established for zorin and xubuntu, we can use them as a benchmark. RAM is 1.5 GB, folks.
4. your input at #1, #9, and #14 are confusing me. is this exercise just for you and the professor on an old pc, or to roll out to a number of students?
if you can answer my questions we can all likely help better.
i am voting for xubuntu - i use both - because the xfce desktop environment is very friendly for legacy equipment.