Hi, I have selected the following options to pursue my online MBA program.

Alliance Manchester Business school
Aston Business School
Robert Gordon University (RGU)

RGU offers an MBA in Sustainability and Energy Transition, which I believe is the energy industry's future as most economies are transiting to renewable. However, the RGU does not have triple accreditation compared to the latter.

Can anyone suggest whether MBA from RGU in energy transition would be a good choice or a general MBA from Aston or Manchester would be better?

This really depends on your development needs. Manchester is an excellent MBA.