I don't know the current state of affairs but I'll chime in. The Air Force likes people with technical majors-engineering, science, and math. There are more technical scholarships than non-tech. After all, the Air Force is the most "techy" service of them all. Back in the day, cadets pursuing a technical degree had a leg up in getting a pilot slot. Again, I don't know what it's like these days.
Once you're in SUPT, none of this matters. Though not always the case, some of the worst pilots I've flown with (students as well) were Einsteins with an engineering/science degree and some of the best sticks were Joe average jocks with a degree in underwater fire prevention. If you can add and multiply in your head at an average pace, you'll be fine. Differential equation has no place in the cockpit.

If you are a high achiever and want a shot at attending TPS, I believe a technical degree is still required but don't quote me. I personally recommend getting a technical degree, if you are able and have the desire, simply because it opens up more doors down the road. JMHO. It is quite a bit more work than pursuing a liberal arts degree but it's well worth it in the end IMO. It definitely helped me out in landing jobs in and out of the cockpit/Air Force.