Having a system requires doing it's tasks. Im lazy so no thanks. Having a loyal companion of my choice requires making another choice, so I'll pass on that as well. Having a cheat ability feels too situational and risky. It'd only work with plot armour so I'll pass on that as well.
Having the protagonist's talent without plot armour would usually just make me a worse protagonist, so that wouldn't make sense to choose either. For example, suppose I were to choose a CN novel. What would my protagonist-growth-rate actually look like when life-changing elixers and fated encounters don't fall out of the sky every time I step outside?
Minor abilities might be useful. I could just run and hide and beg for my life for three years. That sounds doable. If I were to do this, I think JP tropes would probably be the safest. CN or KN are often a bit to violent for this to work.
With that, I think high background is probably the safest bet. Education and technology probably means this would be the least drastic environment difference, and so offers the best chance of survival.
Edit: I suppose having a high background would need to require some additional information, such as how I actually get that high background in the first place. If Im born there, that means the entire events will take place between when I'm born to three years old. If I'm a transmigrator or possessor, that's a problem in and of itself. Best option for me would probably be to assume I'm randomly adopted into the family?
With that in mind, maybe having minor abilities would be more reliable.
