I have to choose between Physics, Biochem, or Mechatronic Engineering for my Bachelor's and I'm kind of stuck (unfortunately no NatSci/combined honours in STEM at my uni).

Physics is more fundamental and I like that it involves advanced mathematics, but it is also more 'abstract', current research is 'weird' (maybe except condensed-matter) and generally speaking I think it would be too hard for me and I would go mad trying to comprehend something like QED.

Biochemistry seems easier, more 'grounded' and biochem research seems more applicable and I like doing labs, but the course barely involves any advanced mathematics and I think I would feel 'incomplete' without it?

Mechatronics is of course different in that it is an engineering degree, meaning more and better paid job opportunities with just a Bachelor's, but less opportunities for research and academic work, but I like that it involves some C programming (which is something I want to learn anyway) and is widely applicable in fields both related to physics (e.g. space engineering) and biology (biomechatronics, implants, etc.), but I think I want something more fundamental and with a more straight-forward progression to PhD and then academia.

I'll probably leave it up to a coin toss in the end...