I do hate evictions because they disrupt everyone involved, but in some cases, the problems will continue to intensify.

Both may qualify but the obvious choice would be the one lease disrupted by the move and the one you can more completely screen with the lease amount of effort and risk.

Second, I would not want to disrupt my tenants monthly budgeting habits, by taking advance payment now and evict next year, because they got out oft the habit of budgeting for rent each moth.

Updating attracts the best qualified and usually least disruptive tenants.  

The idea is that one pane of glass is a different thickness as the other... thus disrupting sound waves.  

She needs to deal with the people staying in her apartment disrupting everyone, whether they're her kid and his friends or not. 

I also let them know that they are disrupting our business and causing themselves to stand out as a bad customer/tenant.

My tenant has been there for approximately 2 months, and the upstairs tenants have been increasing disruptive and hostile to my tenant.

I know that might disrupt some things and I might have discussed these two options with the renter in the very beginning so they know there's some sort of expectation but this would likely be my plan of action.

My question is what do you think the best route would be to get rid of the disruptive tenants?