minium ipad version to run davinic resolve?

What is the best cost performance ipad to run davinic resolve, to do basic editing such as cutting short 30s clips, exporting them etc, while on the road? There are too many ipad versions/models (ipad, ipad air, ipad mini) out there and I am at a lost on where to even start. This is meant to be used while on the road, in potentially cities with high crime rates, so trying to spend as little as possible (under 500?) while still being productive.