Hello everyone! I need another piece of advice from you all on NOC 4012 reference letter

My department says they can provide me with letters in two ways:
1) My PhD advisor (and I TAd for him) could write me a letter stating my duties, and our department administrator would write the letter stating the hours/salaries/other info, or
2) Our department administrator can write one letter stating everything from duties to administrative information.
Which do you think is better? Thanks to you all again for advice!