Sora may have newer technology, but it doesn't mean it works better or is more dependable. It's probably just the opposite, and DT shifters are hard to break.
As technology advances the parts don't work as well?
It's been my experience that upgrading already decent parts (like sora) to more expensive ones rarely does much. I've done it before and regretted wasting money.
I only posted to encourage the OP to not water his/her money.