Would switching from LSE econ to econ & maths be a bad decision?

Going into my 1st year and my thoughts on doing this are:
a) it would leave more doors open for me
b) i am now more interested in maths so this degree suits me more
c) maths is more respected
BUT i've heard LSE econ is much more prestigious so I should just stick with that. What should I do?
To what extent will doing LSe econ be advantageous over econ & maths? Is there a difference to employers, etc?

Theres already alot of maths in their economics course, at least wait till youve actually experienced what the modules are like before considering a switch

not really, just calc and linear algebra and its all applied to economics