Based on personal experience, I recommend sticking with vNodes, which, for me, have far outperformed my pNode.
Since I bought it in early April, my pNode has earned only once. Despite this inactivity, the pNode looks operational to me, to @Raz’s cool diagnostic tool, and to Incognito support as well. Yet it does not earn. I spent $399 on something that, in more than one month, has paid me back no more than $24. By contrast, a vnode I spun up last Monday has earned nearly $55 in two weeks. I think my vNode easily will help me recoup the cost of the underperforming pNode.
Now, the marketing says that, over the long term, all nodes should earn roughly the same. If you were to buy a physical node, perhaps this earning potential would bear true for your individual device; however, with my particular pNode, I have to question that assurance, and I have to warn others.
Nevertheless, I am looking forward to the new pNode tree–in part because of the space-saving stackable design, but also because I believe they have addressed some of the deficiencies of the original Node. If you are interested in the physical hardware of Incognito, I suggest waiting for next gen.