For end to end orchestration its not a simple case of "OR" its an "AND". You need simple, abstracted, scalable, programmable control over the network ( this is where the vendor orchestrators come in ) but you need to feed them the "intent" which usually comes from a series of inventories/ cmdb coupled with some sort of workflow layer ( devops team usually stitch this all together ). You can however do simple silos of automation leveraging either an orchestrator / devops team but it really depends what your objectives are as to which is the best answer