Q. Which is better RE Himalayan or Thunderbird 350X?

It depends on what kind of RIDER you are I mean if you are looking for a off road adventure+ highway crusing then you should go with the Himalayan and if you want a bike for daily commute and also highway crusing then you can go with Thunderbird 350x .

If you want a leisure lazy ride position TB350X. Otherwise you can choose Himalayan. Himalayn gives a feel of a long owned vehicle comfort even in your first ride itself ..That comfort level cannot be experienced in TB350x

350x is better for daily use. Himalayan daily use would not be good in terms of cost. But for touring or long rides or even going to the mighty himalayas, Himalayan is the best.