Teaching is such an underrated profession I find especially when it comes to situations like university vs elementary. It is not an easy job and I know that as much as I love kids, I wouldn't have the patience to do it.
If it were up to me the more skilled and experienced the professor, the younger the kids he/she'd get to teach. The younger the age, the tougher the job and the more demanding it is. That aside, he should consider his income too.
It's tough in terms of many things. What which each do for him in the long run? Jekyll is a scientist so working at a university would get him a farther, but working with children brings him a lot of joy. I mean, Jekyll is dad material after all hence wanting to get married and being charged with watching his niece and nephew. It's a tough decision between joy and opportunity.
