I have no clue how much exp it gives right now, but I can confirm that previously getting Praetorium always meant a pretty safe level up. Castrum Meridianum on the other hand was shit, because it only gave around half a level.

To be more precise:
During Shadowbringers, when I had a job level 79 and was at 0-5% exp it once shot all the way up to over 90% and all I had to do was 1 trial roulette and I was 80 with that job. It was even something I kept recommending to newer players in our FC.
"When you're getting close to max level, don't do your MSQ roulette right away. Save it for the moment you hit level 79 because that's 1 MSQ roulette and you're max or at least almost max."