With the release of vSphere 6.5 there is really no reason anymore to stick with the old school Windows vCenter; finally the vCenter Server Appliance (VCSA) has become a first class citizen and the preferred implementation solution for the most important vSphere infrastructure compnent. This was already made clear by VMware when in 2016 they released a tool to easily migrate a Windows vCenter 5.5 to VCSA 6.0 U2 and with vSphere 6.5 the migration from an older Windows vCenter server is one of the officially supported upgrade paths.
Although not new – it was inherited from v 6.0 – one of the best features of the VCSA 6.5 is it’s ease of upgrade. I tested it myself in the homelab taking advantage of the first maintenance release (6.5a) which was released last week bringing support to NSX 6.3.