Professor wants to change my thesis' interpretation in favor of his research. How to react? I am about to finish my undergraduate thesis. The interpretation/conclusion i wrote is basically a statement which matches well with research of other groups and has a widely accepted scientific background. 

After letting my supervisor (who has been mentoring me) and then my professor(who gave me the topic and is in charge of the decisions in the group) control my thesis, my professor wants me to edit my interpretation and write one which mainly goes along his research but is not widely accepted in science. 

My supervisor said I should do what my professor asks me to.
Should I?

Edit: My professor asked me to change because I had no clear evidence for my assumptions. But I would not have any evidence for his suggestions neither.
It sounds like there may be potential arguments in favour of both interpretations. First pin down what they are - then you're in a better position to have a discussion with your professor. It may turn out that one of you is unambiguously right - and that's a good way of finding out. More likely, there are arguments for both interpretations, in which case you might be best off presenting both together with some critical analysis.

TL/DR: Follow the evidence. Without providing any evidence, neither of you is demonstrably right.