Most probably, people opt SolusVM, because it's the best solution for vps and if you have more than ten vps clients, then you can experience how good it is. Also it has a plug-in for WHMCS along with several other cart systems. So we can say it's a good vps panel, but in my opinion we should have to give a chance to virtualizer, as it's a product of softaculous so I guess it will be able to cope up vps management operations easily. However, all it depends on the personal choice, but experiment with vps panels can definitely show the difference.