20 laptops or 40 desktops?

So now, as I watch my high school budget dwindle for last-minute summer purchases in favor of a desperately-needed elementary and middle school tech refresh, I have to ask myself, should I buy 20 laptops for 40 desktops? People can argue the math, but when it comes down to it, I can still buy a lot more reasonably-equipped desktops for the same amount I’d pay for 20 laptops. In fact, looking at the state contract pricing, with my current budget, I can put a new desktop computer in every classroom. On the other hand, I can replace roughly half of my teachers’ aging laptops.