All bikes you have shortlisted make for good beginner bikes with their unique strengths. The Yamaha XSR155 / MT-15 will be the lightest and easiest to manage machines with a sporty and engaging engine + chassis combination. They will also return excellent fuel economy. However, over long stretches of bad roads, the stiff suspension will cause some discomfort.
The Honda CB350 H’ness and Royal Enfield Hunter 350 are laid-back roadsters with torquey, smooth 350cc engines. They will be more comfortable but will not have as good fuel economy or handling capabilities.
It all boils down to the sort of experience you are after and the design you like the most, so a test ride of all four is in order.