Hey H2016,
Well one of the main objectives of a good LOR is to give a 3rd perspective view of you as a person. It also acts as a 3rd party certification of what you tried to portray in your application essays.
Now comign to choice of refrees,
Some schools such as LSE, strictly ask you for 2 academic refrees, so no choice there.
In such as case make sure though, that both the refrees highlgiht different elements of your profile, and dont repeat the same thing all over again.
One can stress on academics while the other on projects and exra curriculars.
Now, if you have a decent amount of work ex, say more than 4 months in a company, a professional refree can be approached.
This us usally preferred as the professional LOR can add a different perspective as compared to your academic LOR, and can highlight several business skills.
Hence for your other targets, 1 prof and 1 academic is completelty fine.
You can check out
https://www.mim-essay.com/mim-letter-of- ... n-service/ for more tips on how to write an effective LOR.