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For VF page:
You can use Standardcontroller for object A & B to directl;y use the fields of correspondig objects in the page.
For Controller:
You can create Sobject of object type A or B and access the fields of corresponding objects.
To access these both fields at the same time in a VF page, go for Controller approach.
Thanks,
Pratik
P.S. If this answers you question, please mark it as "Best Answer" so it will help other community members too.
Hope this would answer your question. If you have any specific business scenario/requirement you can post that.
Thanks,
Pratik