the top pic is of a phunnel where it has a large hole and is shaped like a funnel you pack the tobacco around it stops the juices from leaking into your Nargile, enchances flavour etc
this pic above is the vortex same packing method but instead of a large single hole there are holes around the funnel area and the top it blocked.
Some people have trouble with phunnel bowls when packed in correcly or the phunnel being too high where it sucks the foil down into the hole Im assuming the vortex avoids this. I was lucky as my phunnel bowls funnel part was below the rim and when packed properly and the foil wrapped tightly over the edges of the bowl it doesnt suck down.
Hope that helps.