Esxi
I had to migrate an OVA exported by VirtualBox to an ESXi 6.
TL;DR: Untar the OVA, copy the vmdk file to ESXi, migrate the vmdk with vmkfstools and create a new VM using the new vmdk file for the HDD.
You got time to read it all An OVA file is a tarball of the VMs vmdk and the OVF file containing all the settings in XML format.