Hi Conrad
The technology for smartphones and tablets now have high resolution for better screen quality. Tablets are a great option if you are going to meet with a client or going on-site and want to show visuals. A smaller size is more convenient and easier than carrying a laptop. When researching the tablets I would look for one that has wireless or HDMI connections so if you do want to show off your VR views on a large monitor it can.
The Samsung Galaxy tab S6 has 287 pixels per inch which will give you good visuals.